It WORKED... with a hunter's pet on me, and it was even in Bestial Wrath.
This is the first time I've experienced world PVP with a hunter on me, so I suppose maybe there's soemthing I'm missing... but with all the talk on here about how vanish is broken, I was sure it was going to fail.
Has anyone else noticed it has been more dependable since 2.3? This is just a casual observation, but I'm wondering if Blizzard "stealth-fixed" (yes, pun intended) vanish. What say you?