I definitely want to watch this. I was surprised by the first one. I'm not a fan of Sandler, because he's one of these comedian actors who goes OTT with his comedy all the time. Yet this movie (the first) was really good and funny.
I liked the first one because of the novelty. Seeing a bunch of comedy actors that are friends and often work together was a good idea. Even mediocre movies usually succeed in that light because of that fact. But a sequel? Granted, I can't watch the trailer so I really have nothing to base an opinion on but my own speculation. It just doesn't need one.
I was able to go see this last year during the Summer, and I now have it on DVD. It is not only an awesome movie, it's one of those rare times where the sequel was better than the first movie to me. It's not very often that I say that.