The line-up is said to include Superman (there is no confirmation yet if Henry Cavill will be reprising the role after next years Man Of Steel), Wonder Woman, The Flash, Green Lantern (again, no confirmation if Ryan Renyolds will be returning), and Batman. The inclusion of The Dark Knight will no doubt send most fans boys into a frothing rage, since the character will be more than likely be rebooted from the version we saw in Christopher Nolan's beloved trilogy. Rumours at the moment point to the new Batman making his debut in Justice League, leading into his own solo movie.
Expect to hear more about this in the coming months. This will no doubt attract insane amount of hype.
Source: L.A. Times