Isn't that called the orc mount?

Worg on steroids? No thanks I'd much rather worgen were just given Plainsrunning like the tauren had originally, seeing wolfmen on mounts will be just blegh.

Yeah the concept art of them on a fluffy boar didn't sit too well with me. Majorly deciding whether to give a chopper to my worgen or dwarf shammy. I'm kind of weird in that I don't like my toons using the same type of mount for their main rides. Except for the chopper. They are that cool :) Then again worgen would probably look cool on a mammoth or kodo.

Plainsrunning for worgen would be OP for the same reason it was for Tauren. Running away from stuff, dropping combat and immediately going to full mount speed? Lovely idea, never going to work.
As for wolves riding wolves... meh.
Not sure how much time worgen will be spending in wolf form on a mount, so alot of the time it'll be just another mounted human.

Worgens should get a 'running' form with a cast time.

you mean this?

http://db.mmo-champion.com/s/87840/running-wild/

Groth, you have no idea how Plainsrunning worked. It sucked so bad that's why they dropped it.

Could not be cast in combat, when cast had a 10-second ramp up time before you got to full speed, once at full speed if you stopped for anything or were hit, you dropped back down, and had to start all over again.

You couldn't do what you described.