I haven't seen that trailer yet since I haven't been to the movies in a while, but my hopes for this movie not destroying a big chunk of my childhood get higher by the minute. (Don't get me wrong... I've always been excited, but cautiously so. The caution is starting to fade quite rapidly now.)
I have the feeling this will be more "Temple of Doom" than "Last Crusade". There are a lot of people who don't like ToD that much, but I really enjoyed it, so I'm not that concerned with how this will turn out.

Lucas has also said that they made it to emulated 50s B-movies than 30s-serials, so you gotta keep that in mind as an element that may make this movie different than the previous films.