Yea.. DDR3 only for Nehalem.
Sockets are LGA1336 for Highend Desktop. 1x Quickpath, 4 Cores, IMC, 8 threads, Tri-Channel DDR3.
LGA1160 for Mainstream.
No quickpath (1x PCIe16 or 2x PCIe8), Dual Channel DDR3, 4 cores and 2 core variants, 8 and 4 threads, IMC.
This might be the killer for Nehalem. Will LGA1336 be like the Skulltrail board where only QX variants are released? If so, I'd end up on LGA1160, which might limit your options for processors. This is why I really want to see AMD come back... I'd rather have a 45nm AMD 4x4 than this crap.. Multiple sockets per processor = bad idea, confusing for consumers, and ties you into a limited line of processors.