I started making my own bad guy mobs, potentially for use for in chat role playing. It would be quite handy if they were able to implement Team Teleport for these kinds of uses. to spawn a group of baddies for RPG reasons.
What other in game powers could they potentially make come back? They might not be "functional" but some area effects might work since there are no targeting for example or various power buffs?
Stealth/Invis/Phase Shift
Personally, I'd like to see all of the visual effects done.