I found a preliminary short list on the new Hunter abilities, I have no idea how accurate it is because my hunter is only lvl 12
Dive 3:
owls in Winterspring
owls (level 50 or higher) in Felwood
Dive 2:
owls (below level 50) in Felwood
Dive 1:
buzzards in Arathi
Dash 3:
Frostsaber Stalkers (the stealthed ones) in Winterspring
Dash 2:
Longtooth Runners in Feralas
Dash 1:
wolves in Badlands