Yeah PoTC3 is going to be excellent. As for a fourth film in the franchise, that's the nature of film making today, I mean the studios are all like hey, this movie did really well why don't we make another one and another, then they go on with the spin offs. Most movies that are part of a series are better as a trilogy. In other words I think it will probably not be as good, but there's always hope. As for a release date I think I've heard that it's coming out on May 25, 2007, the week after Spiderman 3.
"Look I have a brain, I just took it out so it wouldn't get wet." - Meatwad ATHF