I originally wasn't interested in this at all. Not even simply because sequels usually suck or whatever, but more because I'm just not that big of Indiana Jones fan. I liked all the movies as a kid, but re-watching them now that I'm older, I think they're all pretty laughably corny.
But I heard that they're not going to be using much CGI (although it looks like there's a lot in that trailer), and instead are going to use more traditional special effects techniques, in order to keep a consistent style with the other three. I think that's very cool, and the Star Wars prequels definitely should've done that. I mean, it's pretty sad that all three of the original Star Wars still more or less hold up to today's standards, but The Phantom Manace is already horribly dated by it's CGI. It hasn't even been out a full ten years yet.
And I also like Shia LaBeouf. He's not in very many dramatic roles from what I've seen (only two I can think of off the top of my head are Tru Confessions which was really dumb, and A Guide to Recognizing Your Saints which was really good), so it's hard to actually judge him as a serious actor, but he just seems like a cool guy and I've grown up with him, so.
And also it's hard not to get excited hearing that theme song. So yeah, even though I'm not a big Indiana Jones fan, I'm looking forward to this.