Quote Originally Posted by TaranTatsuuchi View Post
If they're smart about it...

They should be able to work on a separate branch of the codebase and then fork it back in later.
Thus, working on new stuff while not affecting the live branch until they are ready to implement it...
They already do this, but they would have to basically remake the game, and add content, while remaking the game, making it compatible for both versions at the same time.