I imagine we'll be seeing another dual movie, one featuring Tornadus, the other featuring Thundurus.
I could also see the Musketeer trio and Keldeo appearing.
That would be interesting, but I doubt it. Thundurus & Tornadus do promote Generation V, like Reshiram & Zekrom, but Thundurus & Tornadus aren't version mascots, like Reshiram & Zekrom. I do see a movie staring the Kami Trio in the near future though, as well as something for the Musketeer Quartet, Kyurem, Meloetta and Genosect, assuming BW can last for four years.
Movie 15- The Musketeer Quartet
Movie 16- The Kami Trio & Meloetta (Both Forms)
Movie 17- Reshiram, Zekrom, Kyurem & Genosect
If BW wont last for four years, scrap Movie 17 and Genosect could just make a big appearance in the anime and have in-game distributions based on that. So, what do you guys think?
Hopefully we get a Movie 15 Preview soon. I do think we could get a reveal of the next movie by the end of the year, if not, I estimate by February 2012 for some sort of reveal of Movie 15.