Whoa, let's not get ahead of ourselves here! Asylum hasn't even been released yet! LOL
The sixth studio album... they'll probably start working on the musical aspects of it while on tour during this record cycle. David won't have lyrics for a while after that. It depends on what goes on in his life at that point. One thing I don't expect is for the next record to be any less dark than Asylum will be.
The tenth anniversary of Believe, though, is something I don't expect a reissue for like with The Sickness, since that was their first album and it put the band on the map. As much as I love the Believe record (because it was the first Disturbed CD I bought), I can't see an anniversary edition for that and the records that follow. Maybe an album of B-sides (who wouldn't love THAT! LOL). That would be awesome!
Those are my thoughts. Agree or disagree if you choose. I just can't think that far into the future except tp say that I'll hopefully have my Bachelor's degree by then!