Intel Sandy Bridge: Details of the next gen | bit-tech.net
Sandy Bridge 'E': Patsburg
Next is Sandy Bridge 'E' (Enthusiast or Extreme, take your pick) 'Patsburg' platform, which features a huge new LGA2011 socket to replace LGA1366 in Q3 next year (although right now that seems dubiously convenient given the year of launch). The larger socket is to accommodate the new four channel DDR3 memory controller this platform will offer, as well as the first outing for PCI Express 3 - of which we'll get 32 lanes bolted into the CPU itself. The lanes can be split between 2x16 and 4x8 for multi-GPU, but again, there's no details about CrossFire or SLI support at this early stage.
Like LGA1156/1155 motherboards, LGA2011 motherboards will have only a Southbridge, but whether this Southbridge is called 'X68' (as some Taiwanese manufacturers are saying), we don't yet know. The new Southbridge seems like a complete update with a real focus on the single-socket workstation and server market as it houses two SATA 3Gbps and ten SATA/SAS 6Gbps ports. The interconnect is still a 4x PCI-E 2.0 DMI link between this and the CPU, providing some 2Gbit/s of bandwidth.
Same goes for LGA1156, I don't understand why Intel is being trigger-happy sa sockets

2009 - 1366
2010 - 1156
2011 - 1155 and 2011 (no pun intended sa year of release

)
AMD is looking real good with each release by trying to hold on to a certain socket as much as possible.
edit more info:
All LGA1155 CPUs will have integrated graphics built into the core instead of a separate chip. This is an upgrade from the current IGP, PCI Express controller and memory controller in Clarkdale CPUs that is manufactured on the older 45nm process in a separate die (but still slapped together the same package). This should improve performance, as all the controllers will be in one die, like existing LGA1366 CPUs.