Getting the weight down to 1.5lbs for each of the tablet and keyboard will be essential. Haswell should help get there. The Surface RT is .5lb lighter than the Surface Pro, partly by being able to remove the fan system the Atom chip doesn't need. It's also .16" thinner.
The weight of the keyboard/dock of the Asus TB is speculated to only weigh more than the tablet to keep it balanced. Bring the weight of the tablet down and the weight of the keyboard/dock can go with it.
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