Nobody knows how haswell will compare with ivy bridge-e. There are probably those like me that believe that intel intentionally crippled ivy bridge with TIM so as not to allow it to compete with their enthusiast segment (SB-E on x79). Those folks would by correlation believe that intel will similarly sabotage haswell so as not to allow it to compete with ivy bridge-e. Then there are those who believe that the 'enthusiast' chipsets are just for people who want to do 3d graphics rendering, video editing, or folding, and that intel really targets gamers with their mainstream chipsets, which they will not only price within reach of gamers, but will actually outperform their enthusiast segment.
no one will know for sure until we see some benchmarks but my money is on haswell being similarly crippled with TIM, and IB-E finally fulfilling the overclocking promise denied to non-LN2 users of IB.
I think mainstream chipsets outperforming enthusiast chipsets was a fluke, a mistake that intel will not allow to happen again.
The other question you should be asking yourself is how gpu vs cpu dependent the games you play are. If your games are highly cpu dependent, and assuming the SB-E vs IB battle occurs again in 2013 under a different name, then you might indeed benefit from haswell... But if the games you play are gpu dependent (such as BF3) then x79 is definately the platform you want to be on. (x16, x16 SLI @ PCIE3.0, and the option to add more cards later if you want).
x79 is first and foremost a *graphics* platform, giving you the ability to run your cards at full capability.
Motherboard Asus ROG Rampage IV Formula x79
CPU Intel i7 4820k Ivy Bridge-E @ 4.6ghz
GPU(s) 3 WAY SLI -- EVGA GTX 680 SC Signature (2GB)
Displays 5140x1050 @ 120hz using 3 x Samsung 2233RZ
RAM 16 GB 2133mhz G.Skill RipJaws Z
PSU LEPA G Series G1600-MA
Case Cooler Master Cosmos II Ultra
Storage Vertex 3 256 (Games), Intel 320 Series 128 (OS), + 4TB HDD