The all 100% ground mounts have been there on the PTR for a while ; it was just confirmed by a blue post.We want people to be able to pick and choose the mount (or mounts) they enjoy using without feeling like they're being penalized. There are a lot of different mounts to choose from and for some people, that mount they got awhile back that was so awesome, lost its luster after that next fast mount came out (source, Via).