Yeah, it makes sense to use Jacen and Jaden (I think those are their names.) Though, in the books, it was the other Solo kid, Anakin, who had something to do with the dark side. I think he was possessed by the spirit of Palpatine, or something like that (I don't really follow the later books.) One of the twins had to kill him, I think.
I've got to agree about the teenage drama, but it might also depend on how it's done. Also, we don't know for certain what the plot will be or how it will be done. Remember all of the speculation leading up to Star Trek? The final film was nothing like what a lot of people "guessed."
I don't really pay attention to fan-made trailers.