Yeah. But guess what, the specification of the Xbox 360 was the same 4 years a go as it was today. Bethesda can't magic up new specifications just for themselves.
I would hold judgement on the PC version of this game. For all we know it could be the lead platform, support DX11, be coded with 64bit in mind (So it can assign itself more than 4gb of ram), have all the fancy god rays and stuff, and look wonderous.
Lead platform is unlikely, but the rest of the stuff is still possible. The bigger a developers budget the more likely it is to create good quality ports with features specific to each version. It's easy to assume a game like Skyrim has a pretty massive budget. They could spend $200million on the game and still make a very healthy profit.