There are a few basic questions to address, in any upgrade scenario.
1) Cost.
2) Performance.
3) Future expansion.
Looking at those topics.
1) You've already plinked down a substantial chunk of change on a socket 2011 board (and presumably a processor). If you bought a 3930k, you're looking at a minimum of $750 between the motherboard and the processor. A new IB system will cost about $500 is you get a moderate motherboard and a deal on a 3770k.
That $250 difference in initial price, once the resale cost of the 2011 setup, might be about $100 out of your pocket (assuming a very good buyer). Let's say that the cost of this new system is $100, after selling the old stuff.
2) Here's the sticking point. 2011 doesn't have the IB architecture on it yet. SB is great, but it still performs less efficiently clock-per-clock than IB. At the same time, SB has much better thermal characteristics (due to an Intel production choice). Architecture aside, the increase in core count means socket 2011 can run 12 threads, whereas 1155 can only run 8 threads.
Because performance is also objective, what you are doing matters. Gaming often utilizes only a small number of threads. Larger, or more complex, programs can often utilize multiple threads. Someone using Photoshop, versus a gaming rig, are completely different performance situations.
3) Socket 1155 is dead. IB is the last gasp before it is phased out for socket 1150. Socket 2011 is supposed to get IB...in late 2013 (two years after it came out). If you want an upgrade path, 2011 is your only choice. The thing is, socket 1155 isn't a slouch, and may well be relevant for the next four years.
All told, I'd stick with the 2011 socket. Yes, you have a higher power draw. Yes, you've got a poor choice of motherboards (read: there were substantial issues). Yes, you've get slightly less performance currently.
On the other hand, IB-e might just save socket 2011 (yeah, it's extreme optimism). You've got an upgrade path, a boat load of PCI-e and memory channels, and you've already spent the money. IB on socket 1155 looks excellent on paper, if you're buying a new system. If you're jumping ship the monetary investment, and slight performance gains, aren't likely to be worth while in the long run.