I'd probably wait for the Lenovo 11S to have haswell, be thinner and lighter. I wouldn't be able to last that long without a computer though. So what I'm probably going to end up doing is selling my surface pro for as much as I can get it, then get the next generation Lenovo 11s.
Don't get me wrong. I LOVE my Surface Pro, but I really miss laptop functionality sometimes like always having a full keyboard, adjustable screen angle, and being able to rest upon your lap. A perfect convertible computer for me would be a thinner and lighter Lenovo 11S with the Haswell chip.