The Banshee, Wraith and other Covenant vehicles all get makeovers for Halo 5: Guardians, and 343 Industries offered a peek at their redesigns this weekend.
343 explains the updates in this way: in the story surrounding Halo 5: Guardians, the Sangheili are sunk into a huge civil war in which both sides have reopened old manufacturing sites to crank out war materiel. The original manufacturers were stodgy-ass bureaucrats, which justifies these sleds' new looks and capabilities.
Canonical explanations of the craft's designs and features are available at the link. The post introducing them, of course, is called "Canon Fodder," so you know this is legit.
Halo 5: Guardians is due for an Oct. 27 release on Xbox One. The game pumped out the second trailer in a live-action series leading up to the game's launch.