I just saw an interesting article in Comic Book Resources with an interview with Geoff Johns. He says that a Cyborg series is forthcoming (hopefully he might add the Metal Men), there are plans for the main Justice League series including 2015's Throne of Atlantis storyline (that means Aquaman will be staying on the team), Green Lantern Hal Jordan will return to the team (thank God), he has plans for both Simon Baz and Vibe (luckily Jeff Lemire has fellow JLA members Martian Manhunter, Green Arrow, Hawkman, and Stargirl on his hands; now what about Katana), there might be a Shazam series, and there might be a connection between Batman and Wonder Woman.
If you ask me, the 2015 line-up for the main Justice League should be Superman, Batman, Wonder Woman, Green Lantern (Jordan), Flash, Aquaman, Cyborg, Shazam, Firestorm, and Element Woman, with Vibe and Simon Baz as back-ups. However, I'm still in love with the new Justice League Canada, but I'd like to see the line-up being Martian Manhunter, Green Arrow, Atom (Palmer), Hawkman, Black Canary, Animal Man, Stargirl, Adam Strange, Supergirl, and Equinox. Maybe throw in the likes of Metamorpho, Centrix of the Global Guardians, and Black Lightning. Since we know that Johns has big plans for Vibe and Simon Baz, he should add Katana to the Justice League as well unless there is a Birds of Prey revival. I don't want Katana to be left out in limbo.