Hey,
No idea if this has been mentioned at any point but thought I'd put it here just incase.
During a Yogg-Saron fight I was gripped by tentacles, naturally I spammed every cd to try and get out, cloaks, vanish etc.
When the rest of the group finished the portals, I was released but noticed, as a combat rogue, although I was moving asif unstealthed, my stealth bar was active and I could use Ambush, Cheapshot, and other stealth abilities freely. I'd imagine it could be a pretty neat advantage in BGs.
The effect only was removed once I re-stealthed a bit later.
Thought it'd be fun to mention. Goodluck.