Personally, I expect that Nolan's Batman films will be kept as a private continuity. Nolan has already stated more or less that the 3rd film is supposed to be an ending to that Batman's story arc. The films are great for what they are, but there's no real way to fit them in to the DC movie universe they might be building.
What I'd expect are, after Green Lantern, a few films building up the DC theatrical universe such as Superman, Wonder Woman, and maybe 2 more between 2011 and 2013. Then, after BatNolan 3 has had a chance to clear out of popular view (it comes out in 2012) a Batman Year One movie in 2014 or a Justice League movie that takes Batman's existence as a given and introduces a version of him that fits in with the theatrical movies.
In a sense, the amazing success of Nolan's Batman franchise is a bit of a spanner in the works of DC following Marvel's cinematic universe, since Nolan's realistic world can't work with all the characters required - and it's the hottest thing DC has had since the original Superman film. So I guess they'll try to work scheduling around Nolan exiting the stage and hopefully not confuse audiences too much by having another version of Batman show up relatively quickly. (One reason Batman Begins worked is that the original Batman films were given nearly a decade to settle.)