The battle-scene promo art is my wallpaper right now. If the story has a feel anywhere near as epic as that scene, this will be awesome (surprised it's only going to be 6 total issues -- though I guess I should be thankful it's that & not a main-book with TONS of tie-ins in other titles).
More characters are probably involved such as villains like Black Adam or maybe the whole Secret Society. Captain Marvel shazam is probably on the side of the circle of eternity wizards. There will probably be surprise villains at the very end who Pandora was warning about at the end of Flashpoint.