It doesn't have to be a power set!
But with the community thriving as it is, and our staffers knocking it out of the park like 99 maniacs, it seems we might have an opportunity to bend our collective heads together and actually build some power sets that we might like to see. How many animation students do we have who could bend the form of CoX to their will? How many programming students could twist the code to forge these sets into being?
Try to be concise, fill a niche that isn't already present, or offer a skin to something that already exists. Try not to overbalance, and use an existing powerset as a basis for your design if you go into more than 'it would be nice to have whips', and remember that if you add something, take something away.
Just throwing out my initial reactions and observations:
Whips (flesh out the flaming whip animations from Mastermind - Demons)
Mastermind - Cultists
Mastermind - Arachnos
Mastermind - Freedom Corps
Mastermind - Ghosts
Flechettes (a ranged powerset with multiple light hits, sprays and cones, and scatterings of lethal damage, perhaps with a toxic or debuffing effect thrown in on various points.)
I'll cruise back later to add more meat to these bones in the future, but what ideas are in your pretty little heads, my cutie patooties? How would you make a mark on City of Heroes?