I personally see no benefit in DX11 support for Atom powered devices!
Their CPU's are only good enough to run DX9 games.
Also the Via chips are not better than the Atom for office tasks, because they are (at the moment) single core/single thread cpu's.
They always will give a certain lag on the desktop experience compared to a multi core/thread CPU, even if they are faster on more advanced tasks like compression or other benchmarks.
That's probably the reason why the Atom is the only chip found to today that has survived the netbook war! Via has an x86 instruction set, and thus could run Windows, but I guess their performance/watt ratio might be low.