Darkseid's up to some shit. Here's what shit he's up to...
APOKOLIPS NOW! THE COMIC BOOK ARC INSPIRING WB’S JUSTICE LEAGUE REVEALED
I gotta say I don't buy into the school of thought that WB can just go jumping straight into this because "Marvel have done all the groundwork for them". Marvel did all the groundwork for themselves by building up that group dynamic over individual films and gave you a team that you cared about or at least knew before even walking into the cinema. The same way that Avengers 2 will have a tonne of goodwill behind it and an already existing set-up for an intergalactic Big Bad.
Justice League will make money simply for having Superman and (more importantly) Batman in it together, so the investment should be fine. But I really don't think it's going to resonate with the general populace anywhere near as much The Avengers did when - outside Bats and Supes - you've got a bunch of characters no one's heard of, a character that already had an abysmally terrible solo outing and two characters everyone knows on sight, but haven't had any kind of introduction whatsoever to film so might as well be unknown entities.
Make money? Probably. Have Avengers' universal appeal? Not fucking likely.