The last point kinda obliterates the first one. Anyway, the new Batman series is only in early development. The next two DC animated series will be Young Justice, which debuts this fall, and Green Lantern: The Animated Series, which debuts fall 2011.
Warner Animation is going to keep Batman on the air pretty much continually since the character makes so much money for them. The same goes for Marvel and Spider-Man (Marvel has Ultimate Spider-Man in development to replace Spectacular Spider-Man).
As for the quality of DC films, the aggregate quality has been high in my opinion from 2005 to the present, with it seems one major exception (that being Jonah Hex, which I haven't seen yet). Batman Begins, The Dark Knight, and Watchmen are amongst the best superhero films ever made. I'll take films at a slower pace if they can match that quality. But I think the pace of DC superhero films will pick up as DC Entertainment's influence takes hold.