I have just compiled an updated list of the most anticipated games for your info of 2011-2012/2013....(NA release date only)
 
This List will be Updated Frequently!
 
Note: This list only includes titles which will be released on PC (These titles will also be released in Xbox 360 and PS3,except some Titles)

March 2011       (Q1)
 
HomeFront       Released

Crysis 2                Released
 
Assassins creed brother hood        Released

NFS Shift 2 Unleashed        Released

April 2011                   (Q2)
Portal 2                        Released
May 2011
Section 8 prejudice         Released
 
Brink                             Released
 
Fable III                        Released
 
The witcher 2: assassins of Kings          Released

Dirt 3                              Released
 
The sims 3 generations (Exp pack)      Released

hunted demons forge             Released

June 2011  
 
Red Faction: Armageddon        Released
 
Operation flashpoint: red river        Released

Duke Nukem Forever          Released

Transformers: DArk of the Moon         (Currently NO PC version is going to release)

Fear 3                            Released
 
July 2011                             (Q3)

 None

August 2011
 
Age of Empires: Online                    Released

Deus Ex: Human Revolution           Released
 
Bodycount                               Released (was there for pc too but now currently for ps3 or xbox 360)
September 2011
 
Dead Island                 Released
 
Call of Juarez: The Cartel                Released
 
Hard Reset                  Released

Track mania 2: Canyon                Released

F1 2011                     Released
 
Driver San-Francisco                   Released
October 2011       (Q4)
 
Spider man: Edge of time           Released (was there for pc too but now currently for ps3 or xbox 360)
 
Rage                             Released

Battlefield 3                           Released  

November 2011
   
LA Noire                                Released

modern warfare 3                   Released     
 
Elder Scrolls V: Skyrim                Released
   
Need For speed : The Run               Released
 
Jurassic park: the game              Released
 
Serious Sam 3: BFE                     Released
 
Batman arkham city                  Released

2011 last releases(December)
 
Assassin's Creed: Revelations          Released
    
Star wars: OLD republic             Released
 
Untitled James bond game          Released (Cancelled for PC,Xbox and ps3 version will be released as Goldeneye:007 Reloaded)
 
--------------------------------------------------------------------------------2012-------------------------------------------------------------------------------------
 
 
January 2012                                              (Q1)            
 
None
 
February 2012
       
The darkness II                   Released
 
Gotham City Imposters      Released

Alan Wake                           Released
 
Syndicate                           Released
   
Microsoft flight                    Released
 
March 2012

mass effect 3                    Released
 
Ridge Racer Unbounded          Released    
             
April 2012                                                        (Q2)
Blacklight: Retribution         Released

Blades of Time                 Released           

May 2012
 
Sniper Elite V2                    Released
 
Diablo 3                             Released

Resident Evil: Op raccoon city                     Released

Dirt: Showdown                      Released
 
 max payne 3                          Released
 
June 2012
 
Inversion                        Released
 
Toms Clancy's Ghost Recon: Future Soldier                     Released
 
The Amazing Spiderman                             Released   (PC version was released on Aug 10th)
 
Spec Ops: The Line                               Released
   
July 2012                                                        (Q3)
 
Prototype 2                            Released
   
August 2012

 Darksiders 2                        Released
 
Sleeping Dogs                       Released

Counter Strike: global offensive          Released
 
Transformers Fall of Cybertron          Released
 
Guild Wars 2                                Released
 
September 2012
 
The Sims 3 : Supernatural        Released
    
BorderLands 2                        Released

F1 2012                                   Released

Fifa 13                                     Released
 
October 2012                                         (Q4)
 


Resident Evil 6                    Released  (Windows version TBA ATM)
 
Dishonored                       Released
 
FIA : WRC 3                       Released
 
Silent Hill: Book Of Memories         Released
 
James bond 007 Legends             Released
    
Medal of Honor: Warfighter      Released
 
Primal Carnage                  Released

Need For Speed: Most Wanted          Released
 
November 2012
 
James Bond 007 legends            Released
 
Call of Duty  : Black Ops 2          Released
 
Assassins Creed 3                    Released
 
Hitman: Absolution                 Released
 
December 2012
 
 Farcry 3                                Released

 
_________________________________________________2013_____________________________________________________
 
 
January 2013                                              (Q1)            
 
Amnesia: A Machine For Pigs               Date to be announced
 
February 2013
 
Dead Space 3                         Released
 
Aliens: colonial marines               Released
 
Crysis 3                                   Released
 
March 2013

 
SimCity                                Released
 
Tomb raider 2012                Released
 
BioShock Infinite                      Released

APRIL 2013
 
None

MAY 2013
 
Metro: Last Light            Released
 
Race driver : Grid 2                     Released 
 
 June 2013
 
Company Of heroes 2           25th
 
 
July 2013
 
  None at the moment
 
August 2013
 
Tom Clancy's Splinter Cell: Blacklist       20th
 
 Lost Planet 3                       27th
 
 
 
September 2013

None at the moment
 
 
October 2013

Batman Arkham origins       25th
 
Assassins Creed : Black Flag           29th
 
November2013
 
Call Of Duty : Ghosts           5th
 
Project C.A.R.S             28th 
 
 
December 2013


None at the moment
 
2013 releases
 

 
Arma 3                                 Q3 2013
 
Doom 4                                TBA 2013
 
Dragon Age 3: Inquisition     TBA 2013
 
The Elder Scrolls Online             2013

Crytek's Warface                   2013
 
Metal gear Rising: revengeance               early 2013   (No PC version as of now)
 
Grand Theft Auto 5               Sep 17th  (No PC version as of now)
 
Watch Dogs                      Q4 2013
 
Command and Conquer General:2             TBA 2013
   
Tom Clancy's Rainbow Six: Patriots (Ubisoft)       TBA 2013
   
XCOM         (2K Martin) (FPS)                   TBA 2013
 
Insane     (THQ) (Survival Horror)           
 
Homefront 2               (Crytek U.K)             TBA 2014

destiny                   2014 (bungie studios)      (No PC version as of now)          
 
The Witcher 3             TBA 2014
 
TBA

Prey 2                                
 
Dota 2
   
Brothers in Arms : Furious 4          
                                                                                    
Six Days in Fallujah
 
Project I.G.I - 3 
     
Fallout 4
     
X Rebirth
 
Untitled Duke Nukem Title
      
Delta force: Angel falls
 
Beyond Good and Evil 2
 
Battlefield 4
     
Tom Clancy's Ghost Recon: Lead the Ghosts
   
They       (Development suspended)

Microsoft train simulator 2   (Project indefinitely postponed )

Halflife 2 EP3
 
Mirrors Edge 2
 
Track Mania 2: Valley
   
Tom Clancy's End War 2  (ON HOLD)

The Crossing              (ON HOLD)

 
(Cancelled Games: microsoft train simulator 2(NOT 100% sure for TS2), Timesplitters 4, Stalker 2 )