Well the day is finally here! I apologize if this is a duplicate thread, didn't see any in the first few pages.
Lots of, what should be, for sure prime time games. NFL.com has three in particular on it's list of 13 must see games in 2013, and all three are in the top 5.
I think for sure the Manning bowl, the Colts game, Ravens rematch are all prime time. The Patriots game I'd think should be, but they never seem to play them in prime time, even last year with the return of Manning. I think we'll also get one on TNF for a divisional game and then one that we wouldn't expect (like ATL last year).
That puts my guess at 5.