Socket 1150 = Consumer = Standard Name (Haswell) = Z87 Chipset
Socket 2011 = Enthusiast = -E (Haswell-E) = X99 Chipset
Socket 2011 = Server = -EP (Haswell-EP) = Csomethingsomething chipset
They've been doing this with their parts since Sandy, and to a more confusing extent with Nehalem/Lynnfield.
What you get over consumer:
- 40 PCI-E lanes as opposed to 16, which means full x16/x16/x8 or x16/x8/x8/x8 PCI-E support for Tri/Quad Crossfire/SLI.
- Quad Channel memory, though that has basically zero effect on gaming.
- Soldered on IHS, rather than the crappy TIM that is on Ivy/Haswell, which means lower temps at higher clocks (generally - it does consume a lot more power though).
- More cores with 6 on the standard i7, and 8 on the high end i7.
Basically, it only makes sense for serious enthusiasts, as well as media creation folks. For standard gamers with 1-2 cards, you're going to want to stick to the consumer socket.