I doubt it Bethesda ports their games instead of making a separate PC version.
Nearly everyone does this, because otherwise it would be far too expensive. However, I recall reading somewhere that Bethesda actually does use two dev teams - one for consoles, and another for PC's - who both share a single "art" team. This would imply that while some tech sharing may happen, they aren't doing a straight port like most publishers. Unlike EA, gamesas seems to have realized there is more to porting than just remapping the console buttons to keys.
However, that said I still wouldn't expect the PC version to be light years ahead of the console version. It will still have to look the same, use the same art resources, etc. I would also bet that the actual "game engine" is identical as well.