Intel's upcoming Socket B will be LGA1366 and AMD's Socket AM3 will likely remain Socket 940.
The Socket B processors from Intel will feature integrated memory controllers, something AMD already introduced with their Athlon 64 and Opteron processors. The first Socket B processors will be Bloomfield (a part of the Nehalem family) and AMD's first 45nm Socket AM3 processor will be released somewhere in mid-2008.
Both new sockets will support DDR3 1066/1333/1600MHz memory. Intel's Socket B will have CSI - no not Crime Scene Investigators but Common Serial Interconnect) and AMD's Socket AM3 will have HyperTransport 3.0.