Haswell should bring bring x86 down to power levels that can be used in a tablet without need for impractical battery sizes and cooling solutions. It a "new" architecture (its successor will be a node drop to 14nm, bringing further power savings, but that's not for another 2 years.) Though from what I've been hearing, Haswell's current biggest claim to fame will be better integrated graphic power in the same power envelope as the current 3rd gen (Ivy Bridge) CPUs. (Up to 2x according to Intel source, I believe.) We'll see how it goes. I just hope MS can/will take advantage of Intel's Haswell design and produce a Surface tablet based on it. It would be the first tablet I would actually consider buying if that happens.