Exactly. We don't know any information other than the fact that Seth wants to make a movie.
As for me, I knew this was coming. Sooner or later, a FG movie would eventually be made, considering how popular the series is. I still like the show and I would like to see what Seth and co. can come up with. Whatever it is, I'm sure I'll laugh no matter what.
As for people looking down on the movie already, I remember a similar reaction when The Simpsons Movie was going into production. People thought the movie was going to be bad based on the newer seasons. Of course, once the movie came out, it turned out the opposite was true. The Simpsons writers were able to save some of the magic they had from their golden years and used it on the movie. I think a wait-and-see approach is more appropriate for this.
As for an American Dad movie, that would be cool, but its not going to happen anytime soon. It seems the show is doing well, but not FG-well. It seems to be on par with Futurama: A show with a dedicated fanbase, but not as big as its older brother.