It's official: Warner Bros. is about to make its most ambitious superhero movie ever.

Just hours after a report surfaced that the studio was planning a Superman/Batman movie for a 2015 release, Man of Steel director Zack Snyder made a surprise appearance at the Warner Bros. Pictures panel at San Diego Comic-Con and announced that "Some s#$t is gonna happen up here."

Snyder first confirmed that he is working on another Superman film, then brought out actor Harry Lennix, who played General Swanwick in Man of Steel, to read something:

"I want you to remember, Clark…in all the years to come…in your most private moments…I want you to remember…my hand…at your throat…I want…you to remember…the one man who beat you."

Oh yeah, that's a quote from Frank Miller's seminal comic The Dark Knight Returns, which pitted an aging Batman against a Superman who had turned government agent. Snyder noted that his film will not be a Dark Knight Returns adaptation, but will draw inspiration from it. All this hints that we're not just getting a Batman/Superman teamup. We're getting Batman vs. Superman!

Oh, and then there's this logo, which reportedly made the Hall H crowd go absolutely insane with a positively deafening chorus of geeking out.

A Warner Bros. press release that went out shortly after Snyder's announcement confirmed that Snyder will co-write the story with his Man of Steel collaborator David Goyer, who will write the screenplay. Christopher Nolan, who served as producer on Man of Steel, will move to an executive-producer role for this film, alongside his wife and producing partner Emma Thomas. Production will start next year for a projected summer 2015 release date (which is already a summer expected to include Star Wars Episode VII and The Avengers 2). Henry Cavill, Amy Adams, Laurence Fishburne and Diane Lane are also expected to be back in their Man of Steel roles for the flick, but the press release notes that "the new Batman has yet to be cast," so start making up your wishlist.

"Whilst our ‘Dark Knight’ trilogy is complete, we have every confidence that Zack’s fresh interpretation will take the character in a new and exciting direction," Thomas said. "His vision for Superman opened the door to a whole new universe and we can’t wait to see what Zack does with these characters.”

Though this as-yet-untitled flick is now official, it's worth nothing that the Warner Bros. panel did not include confirmation of the rumored Flash and Justice League films we heard about earlier today. That doesn't mean they're not on the way, though. In fact, maybe they're what we can expect to hear about when Comic-Con 2014 rolls around.

And there you have it. The biggest movie news to come out of Comic-Con so far, but we're not done yet. Your move, Marvel.

(Via BusinessWire, Bleeding Cool and io9) (Photo via io9)