I think assumptions around the name Afterburner has caused a bit of confusion in the update.
Afterburner has had its behaviour altered (refocusing on in-combat benefits rather than travel) and has been renamed to Evasive Maneuvers. It covers a lot of the functions that Afterburner had, had the 'Only Affecting Self' removed and added immob and -fly protection plus knockback resistance.
Flight now has a new power built in called Afterburner, which gives short boosts to flight speed. It's a new thing, not related to the old Afterburner.
So Evasive Maneuvers hasn't been 'added' so much as Afterburner has been adjusted and renamed. The new Afterburner has been added.