wow, a potential four and a half year gap between movies is just ridiculous
There was 4 years between Back to the Future and parts II & III.
Seemed to work out okay.
There was also a 4 year gap between Die Another Day and Casino Royale.
There were 3 year gaps between all the Spiderman movies, as well as Batman Begins and Dark Knight. I don't think an extra year will hurt things much. I'm sure word of mouth is going to be huge before hand.