Seems like to me it has to happen at this point. If they don't have a trailer ready to go with roughly three and two-thirds months until it's supposed to come out, either they're just waiting until the last minute, or they don't have enough footage finished to put into a trailer, which is really bad. Pushing it to December wouldn't be that bad a thing anyway, because I guarantee the majority of the public still thinks this film IS coming out in December. Only the more hard-core fans know it's supposed to come out May 25th, and that's because The Star Wars Show tells us that every chance they get. If they manage to get a trailer out soonish after the Super Bowl this weekend, there's going to be a bunch of people going "wait, it's coming out in MAY?!".
I'm worried. Everything points to this ending in nothing but disaster, but then I remember Lawrence Kasdan wrote it, which will make it even worse if it is a disaster, but means it could still turn out great. I saw a thing the other day (couldn't re-find the article) saying that they were doing reshoots LAST WEEK, when they already reshot most of the film. The Behind-the-Scenes documentary on the Blu-Ray is going to be VERY interesting.