I like this news. I'd rather have JL seperate from every single solo franchise, then to have it seperate from some, and in the same universe as others. It'd be kinda wierd to have Flash take place in the JL universe, but Batman, Superman, and GL take place in a different universe.
All or nothing, basically. I'd prefer all, to be honest. They should wait until Bale is ready and willing to do JLA, then bring on Routh and have a single DC Film Universe. But at least this way I can pretend the JLA movie doesn't exist (and the way things are going it looks like it wont), and conitnue to enjoy my solo superhero films.