My idea is to include teleport, jumping, speed or flight centered primary (or secondary) attack power sets. Of course other characters should still get a classic version as a way to get around the map.
-Quickly drop down on an enemy and deal AoE damage based on what height you started.
-Pick enemies up and throw them from elevated positions.
-While on the ground: knock down surrounding foes to quickly become airborne.
-Spin rapidly to create a devestating whirlwind (would look cool with spread wings, if a character has them)
-Teleport behind an enemy to empower your next attack and loose aggro (placate + build up)
-Grab a foe and teleport together with him while showing him incredible horros of whatever twisted dimension you enter while teleporting, leaving him in terror after reappearing.
-Chaos field that periodicly teleport enemies in the area to random nearby locations, disorienting weaker ones, while reducing cooldown and costs of friendly hero (or villian) teleport powers in the area.
-Re-materialize inside of a wounded foe, to attempt an execute.
(Old known powers like self flight/teleport, teleport friend/foe would be included as well)
Jumping and speed attacks should be easily imagined.