Its actually not the galaxyforge they really need to update. Modders can add pretty much any object in the game to it without a problem (see a custom galaxy forge updated for diplomacy). Its that the game won't recognize those objects without modding the actual game as well, which is a big problem for multiplayer.
That said it looks like they will be updating the galaxy forge eventually, and they may have to if Rebellion changes the map structure. Who knows if they'll add things like titans without needing mods though.
