Righto since I'm busy on the PTR anyway I quickly made some screenshots for the people interested.
First of all here is the animation. Bear in mind I'm very zoomed in and it's not as visible or bright if you have your camera in a normal position.
This is to explain roughly how big the cone is. I got to this conclusion by getting loads of procs in all kinds of different positions and moving my pet back and forth. The green symbol is my pet, the blue area in roughly how big the cone is, and the yellow is a target dummy. I just now realized that my cone has been drawn a little poorly but it should get the point across. The red cross is a raid marker you can ignore. (You can even see the animation of the cloak in that screenshot in the middle of the cone)
And what I think is the most interesting, this is the text Hunters see when they read the cloak.
On the bright side, RPPM mechanics now have their RPPM on the tooltip which actually changes with your haste and such. Finally we can see RPPMs in-game without having to calculate them ourselves.