Justice League: Gods and Monsters" features an original story by Timm, and isn't related to the 2001 comic "JLA: Gods and Monsters" by Dan Jolley and Josh Krach. ...
No other details were provided for ... "Justice League: Gods and Monsters."
WB did say that one of the three films they release each year is out of continuity from the other films, so maybe this will be!
"Moving ahead, the plan is to release three DC Animated movies each year. Two will be in this continuity and the third will be standalone."
After all, Throne of Atlantis and Batman vs Robin, both also set for 2015 release dates, seem like they should be in continuity...