No, I believe all of the actors are committed to 3 films. Everyone is looking for the next runaway series.
The big story on the casting was that they picked a blonde guy to play the dark-headed role and vice versa. Supposedly all the teen girls threw a fit. They obviously forgot about hair dye and/or wigs.
Lenny Kravitz and Woody Harrelson are in it too, so that could be cool.