So on the Test Server, Afterburner is a bonus power rolled into Flight, and a new toggle Evasive Maneuvers has been added to the pool. I think two 'combat flight' powers is a little weird, so I am spit-balling ideas for an alternative. Examples:
Propulsion Blast - the same power that gives you flight can also be channeled into a ranged attack. Pretty straightforward, causes knockback.
Altitude Training - auto power that gives +Recovery and resistance to End/Recovery debuffs.
Anti-Gravity Field - Hover but with a Repel effect.
Feel free to add your own, or if you like Evasive Maneuvers, that's cool too.