Indy, definetly! It has the biggest potential amongst the list for a really good movie.
Zorro 2 shouldn't be too bad. I liked the first one and the second has Hopkins back, so unless the trailers make it out to be really bad I'll probably see it.
Rush Hour 3 has some good potential. They've kept the core team of stars and director, so it's just up to a good story. The same goes for Pirates, though for that one I have NO idea what they'll do for a story. Though if it's Pirates 2: Curse of the Zombie Monkey, I don't think I'll be going to see it.
Die Hard 4 has potential, though it all depends on story and villian. They've been good in that department before, so it has strong potential.
MI3 and JP4 are 110% pure money grabs. I don't expect a lot, if anything, out of them. Knightrider... that'll have to have some PRETTY good buzz to get me anywhere near it in theaters.
I figure I'll SW3 just to finish off the series and see if Luscas is finally successful in his crusade to bury that franchise. Edit:BTW, does anyone know what they're calling this? Rumours, anything like that? Or is Lucas going to be honest and just call it "The Quest for More Money"?