Which game would you rather see announced?
Personally I would rather see a new Fallout. Skyrim was only 2011 and Skyrim is still fresh so I don't think a new one is needed yet.
Fallout on the other hand, was like 3 years ago so it would be interesting to see what a new one would be like. Dynamic weather effects, improved melee, etc.
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Skyrim is still rocking, and Bethesda has shown no signs of stopping support for it any time soon. Let Bethesda work on Fallout for a minute. I'd rather them take the next 3-4 years working with the new gen tech to deliver a very well polished TES VI rather than rush one through.