I've not found any reports which hints of Haswell's CPU performance being any major leap over Ivy Bridge. It's iGPU performance and power efficiency per clock cycle has caused a bit of a stir for the laptop/HTPC market. Assuming there is a higher demand for Windows 8 in Q3 of this year the laptop market might see less of a negative slump compared to 2012, especially if Haswell delivers in terms of efficicency and iGPU performance.
It's a long way away, but you could tide yourself over with an affordable CPU, motherboard, GPU and RAM now, invest heavily in the other parts - water cooling, case, etc - and then prepare for the high-end Ivy Bridge E and AMD's/Nvidia's single/dual GPU king.
In any case, its one of those times yet again where 'the next best thing' isn't just hear say but might actually be worth waiting/saving up for.