I haven't heard of any other socket for the Extreme series, so I expect it'll be Socket P. In single-CPU Socket 2011 boards and CPUs, the QPI pins aren't connected. And the FPGA probably won't be included in all SKUs. So, yeah, it'll waste some board space and result in larger-than-necessary CPU packages, but the overhead probably isn't worth creating yet another socket just for the single-CPU extreme/workstation/server market.
Then again, Xeon D has its own socket (FCBGA1667), so maybe...
And the FPGA probably won't be included in all SKUs. So, yeah, it'll waste some board space and result in larger-than-necessary CPU packages, but the overhead probably isn't worth creating yet another socket just for the single-CPU extreme/workstation/server market.