i think meta-flying would be too awesome, and would generate jellyness
atleast make our mount able to fly
As long as it doesn't get the flapping mechanism of the hyppogryphs in Hyjal that would be horrible.
real Warlocks don't fly, they crash to the floor in a Meteor then /flex
The funny thing is, Illidan has all the requisite animations for flying, which could easily be ported over to the Metamorphosis model.
The problem is that, to really do it properly, it would need to be a seperate, third form (Demonic Flight Form or what have you) that functions the same way as the Druid Flight Form. And it would only be available to one of three specs.
I did once have an idea for a glyph for Demonic Leap, where instead of just leaping up/forward, your character would leap and hover in place for 2-3 seconds. While hovering you can press the skill again to basically Heroic Leap, using Illidan's dive-and-smash-the-ground animation. If you press nothing, you'll fall back to the ground.