The LEGO catalog for retailers is available and those who have had access to the visuals (mostly preliminary) it contains report many details on the sets expected for January 2015 which will be stamped "Justice League"(logo on the box).
I offer below a summary of the information available on Eurobricks.
76026 Gorilla Grodd Goes Bananas : Gorilla Grodd is a Bigfig . This set contains the Invisible Jet piloted by Wonder Woman, a mech/exoskeleton for Batman, Captain Cold, and Flash.
76027 Black Manta Deep Sea Strike : This box contains a Bat-Sub , a shark, another underwater vehicle for Black Manta, Robin and Aquaman.
76028 Darkseid Invasion : This box contains a ship that is believed to be the Justice League 's Javelin . Superman, Cyborg, and Hawkman are included in this set, along with a Javelin pilot.
76040 Brainiac Attack : Brainiac, Superman, Martian Manhunter, Supergirl and a module for Brainiac identical to the one seen on the cover of the LEGO Batman 3: Beyond Gotham game.
