According to the Newsarama interview with Geoff, he's only responsible for writing the general state of the world, its characters and the whole story behind why all these new superheroes (that'd be us) are suddenly cropping up everywhere. Beyond that, nothing has been confirmed, although he did say it'd be possible to come back to write more stuff. In that regard, Geoff also says the game will be set more or less within the current DCU at the time of launch. Players can expect to see story arcs both new and old -- or something like them -- to eventually show their faces. If DC comics fans were only a little excited before this is a reason to start smiling, or maybe even do a fist-pump. Go ahead, we won't look.