during "Ever Watching From Above" you will have the opertunity to take the form of 4 different un'goro mobs, each with their own skill set and factions. the Pterrordax form is uselss as far as i can tell and nobody was around for me to test the Bloodpetal skills on so i cant comment on them but the Diemetradon and Gorilla forms can be used for some fun. the gorilla form allows you to attack members of your own faction which can be a bit of fun (especially if you have a lowbie friend that you know is going to be in the area) but other than that it is pretty much useless. the Diemetradon however can be used to attack people as they land at the marshal's stand flightmaster without the guards attacking you, and if the person you are attacking attacks back the guards will aggro onto them and kill them quickly (level 85 elite guards hurt).
when you are in these forms you have a couple of abilities but they are mostly useless so you will have to rely on auto attack so unless you have the guards helping you you wont be killing anybody near your level, but as a level 80 death knight auto attack was easily enough for me to kill the level 50's i found questing there.
if you turn in the quest you will lose access to these forms, when you complete your objective you will automatically get booted out of the form but you can just enter it again easily enough as long as you still have the quest.
sorry if this is a repost, i did search but got bored after 30 seconds of searching.
[edit] also as a useless side note, acording to wowhead you can talk to hunter's pet gorillas while in gorilla form but they only say the same thing as U'cha (the red gorilla in the cave)