Yeah, I would say 720p, then upscale to 1080p. I think it will sell really good and then there are the post x-mas sales. People will get Witcher or Skyrim first, then the other later I think. Long term, it will make them shit loads of money since CDPR is a small team and I bet it did not cost that much to make the game. The port is not going to be that hard and the return on investment will be huge for them.
I mean they sold 400k in hte first week, who knows where that number is now. Add about another 500k or more in 360 and yeah, those darn polish folk will be rolling in dough...which gives them the ability to get a few more people on the team for Witcher 3 and more DLC support for Witcher 2.
Long term, I can see TW2 selling 1million plus on the 360 in the first year. I really wish they would port Witcher 1 to console as well.