It would be pretty awesome if he was a DLC squadmate.
it would also be pretty awesome if he somehow got tied up against Zaeed and you had to pick a side, getting to recruit the one you save, but if you dont have zaeed then you just get Ezno anyways.
Hopefully if he does get DLC in me3 that he has better voice acting thsi time arround.
having a biotic with tactical cloak would rock. It would be awesome if his abilities were really close to his set in that game (dropping a DoT biotic bomb, the homing missiles. Those would both make awesome bonus powers for shepard to learn) Getting those guns and armors that he had in the iOS game would be pretty awesome too. (that bazooka...)
As much as I want ME2 guys back, I also like having some new guys too.