I barely see this MMO do any colaborations with other franchises, or stuff that is even inside of the DC universe. Dude, if we had a colaboration with Arrow or Flash it could bring new players and please old ones. PSO2 does this with all sorts of other things that aren't even part of SEGA. http://www.bumped.org/psublog/pso2-jp-ac-scratch-magical-prism-phantasm/
Licensing is what holds that stuff back. DC is the IP of Time Warner. Collaboration would require legal approval that I don't think anyone wants to deal with.
We'll see more influence and the like from DC Comics tied into the game over time. Thats about as far as it will go.
speaking of a colaboration with arrow.. they did add The ARROW's oliver to INJUSTICE the mortal kombat dc game... it was a dlc... stephen ammell did the voice and everything... people have asked,,, WHY doesnt he do the arrows voice in this game. jens said something about it in one of the FNLs.... i think it would b awesome but i could see them adding grant guston as flash but the arrow compaired to green arrow. is a totally different type of character . i would like it but not sure what the total vote would be... ARROW is more like batman type character then the Comic book Green arrow
Devs barely have time to fix all the stuff that needs fixing in the game plus they're busy with new content too. How do you expect them to do a collaboration with other franchises?
Different people do different things, I'm pretty sure that the ones fixing content aren't the same ones coming up with new concepts and ideas for new content.