I am pretty sure they are instituting a new type of flying called ground flying where your mount hovers just above the ground. That way they do not need to create a million different new running animations.
I just hope the anti-fly fan boys do not get upset that there is going to be ground flying added to the game. After all it makes sense to alienate 85% of the payerbase I mean playerbase so 15% of the payerbase is happy right? That makes sense right?