Will Mounts be able to jump?

[Coglin]

I don't see why they can't jump over simple obstacles. Nothing outlandishly high like the races can... but just for basic obstacles.

Because the entire in game worlds collusion detection was based on an inability to jump. Thus to impliment it, they will have to spent a ton of man hours readjusting the world to remove all avaliable exploits players can use with jump. I prefere they use that time for real content, more classes, more jobs, and more anything but that in general.