Warner Bros. is so confident of Man of Steel's success that they've greenlit and fast-tracked a sequel. Not only that, it seems that the Superman movie has filled them with such confidence that they have screenwrier David S. Goyer tackling Justice League.
Deadline is reporting the sequel news, which is official; the Justice League news is a little more nebulous. The speculation comes from Goyer's three-picture screenwriting deal with WB, which included Man of Steel, a sequel, and then presumably Justice League. The other part of the equation is this tweet from Latino Review:
While I'm skeptical how Goyer would announce a Justice League movie in a manner that only Latino Review would half hear, it seems likely that the tweet was inspired by this far-less concrete quote from Goyer on the red carpet:
They’ve got a little kryptonite pellet embedded in my heart and if I say anything it will explode, but I would be a very rich man for all the times I was asked that question. It all depends on how the [Man of Steel] does. I would love to see a Justice League film, absolutely. Put the Avengers on notice.
That said, I think Goyer writing Justice League is a pretty safe bet, since he's proven a consistent winner with the Dark Knight movies and now, presumably, Man of Steel. But he's just the latest of several hundred people to write a JL screenplay, so I'd say there's plenty of time for WB to get cold feet. On the other hand, I think Goyer probably has the best shot out of anyone of actually getting his script made, though, so at least that's something. And hey, at least we're getting another Superman movie, right?