I have some idea about the up coming albums, actually, but I can't say that I know all of them, for sure. So far I know the Donkey Kong 3 album and Kirby album are pretty close to being finished completely, according to the project threads, and there's a few other albums on the way, too, so... perhaps five to six albums on the queue, as a guess.
As for the order of release, it's really a matter of who shapes up the post-musical content the fastest and/or whomever has a special reason to be released at a particular date (the Wild Arms album, being the 15th anniversary of the game, being a good example of that). Other than that, I think OCR tries to have at least a 6-8 week period between releases so that every album will have at least a little time in the limelight before the next album pushes on, so if all of the albums need to get through before the FFIX album can do so, it'd probably be a 8-10 month process after it's submit into the system.
I'm doing something that's close to an ass-pull for numbers, though, so don't worry too much - it'd likely be sooner than that, 'cause we all like Fishy. This isn't a finished album, though, and until those last few tracks come through this album won't even be in the system, so for the moment these guesses and estimations are moot.