On this note, the specs for the next MBA refresh, should there be one this year, should actually be worse than the current MBP specs, correct?
I'm also on the fence about whether to buy an 11" MBA now or wait but if the next MBA will only have i3 sandy bridge with and intel IGP I would be perfectly happy to buy now which would then allow me to avoid SB altogether and be a buyer when MBAs get Ivey Bridge.
It seems that there is no i3 ultra low voltage so the 11" will have to get at least an i5. See the
Processor list on Wikipedia (under Mobile Processors). The only ones with a low-enough TDP for the 11" are the 2537M (i5, 1.4Ghz), 2617M (i7, 1.5Ghz), or 2657M (i7, 1.6Ghz). I don't see any others that would fit. For the 13" I suspect the two 25W cpu's might fit the bill.
However I'm not entirely sure this list is correct, I'm a bit surprised there is only one i3 mobile model.
If this turns out to be correct I'd expect the next base MBA to have the 1.4 Ghz i5 and the ultimate the 1.6Ghz i7. But this is all speculation of course.
Edit: Just wanted to add: Due to the fact that these are ultra low voltage processors, I'm pretty sure they will perform worse than the MBP even though they're i5/i7.