Does this support DDR3 memory at speeds up to 1600MHz?
In all probability, yes, for the higher end models. For all others, it may be 1333Mhz. Like Nehalem, the memory controller is in the CPU, so depend on the model will tell you what the default DDR3 spec is.
Will this support Xeon E5 1660?
No, the Xeon E5-2600
series are what will go in this board because they the extra QPI link enabled to communicate with the other CPU. Current estimates for the CPU series is sometime in March 2012
-- which is when I would expect EVGA's SR-X to show up.
Note: EVGA may not initially test all seventeen CPUs in that link, just a few users are most likely to get first. Intel made twenty-four Xeon 5600 series parts while EVGA initially listed about eight CPUs for SR-2 and now its up to seventeen. The support list is just what they tested, if you want to keep your warranty, you'll be advised to get those first.
Will it support any future processors like the IVY Bridge-E or ones with more cores?
There will be Ivy Bridge-EP processors for this board. Keep in mind, these boards exist as server boards and the market is giant (bigger than desktop and laptop combined), meaning Intel will bring 22nm shrinks with more cores, at this point 10-cores are possible
<message edited by lehpron on Saturday, November 19, 2011 7:36 PM>