I do know one thing I'll be doing right before I play Skyrim.
I'm going to walk to the border of Tamriel on Oblivion, look off into Skyrim dramatically, say something intense, turn off the game, and put in Skyrim.
Please record yourself doing this, that would be so awesome.
As for me, it depends upon whether or not my novel is finished. If it is, I'll be looking at naughty things on the net to distract myself. If it isn't, I'll be working on it, and probably having to go back and delete numerous references to Skyrim, such as typing my main villain's name as Alduin, or having my main character get attacked by giant spiders and dragons, or turning their weapon into an axe.