Lady Gaga's suggested that her new album 'ARTPOP' may well be split into two 'volumes'.
Posting some info about the album on her Little Monsters thing (as quoted here), she said: "It’s a bit more modern. You never know if radio is ready. I can’t decide how to tracklist it yet."
"Sort of thinking that vol. 1 should have all the commercial songs and save the experimental material for vol. 2," she explained, which sounds half promising.
As for the app thing, it's all coming along rather nicely, thanks for asking.
"I’m flying back to Chicago to work on it," she said. "The developers on ARTPOP are all like 22 and genius kids. You’d be surprised how many genius little monsters there are."