Woot! I was hoping they'd do a World's Finest movie (well, it's not technically confirmed to be World's Finest yet, but I wouldn't be surprised if they at least borrow some ideas from that) prior to any sort of Justice League movie. I can't wait to see who they cast as the new Batman; and hopefully this iteration will embrace his comic book roots a bit more than the Batman of the Dark Knight trilogy did. A tone similar to the Arkham games would be ideal, IMO.
I'm also loving the announcement of a Flash film. I'm kinda surprised they're not doing a Wonder Woman film, too, but I guess they're still a little squeamish about that idea. I'm also confident that they'll introduce either a recast Hal Jordan or one of the other human Green Lanterns in Justice League