I wouldn't worry about the connection, it's probably just to cash in on the success of the games.
As of right now, it does sadly appear that way. I can forgive that, though, if it's a good movie. But this is (from what I can remember) the first DC animated feature that doesn't interest me at all from the first trailer.
Anyhoo, I picked up the Zero Year Flash tie-in and Detective Comics #30. I like what I've read so far, and that last page definitely makes me want to pick up the next issue. I just recently added Batman Eternal as well as Batman And... to my pull list though, so I think that's enough Batman per month. Still debating on whether or not I should get the rest of the DC Icarus arc or just wait for the hardcover instead. That art is definitely worthy of the hardcover treatment.