September is going to be such a Gaga heavy month!
This makes me think she will release the tour dates around the same time as the album / single announcement. And didn't she say on LittleMonsters.com a few weeks ago that the tour will be hitting Europe again in April?
If the new album is released in late 2012 I think the North American leg and the second European leg will be a joint tour for Born This Way and the new album.