Ok.. This AV weekend I have seen a Orcish Warrior lv.70 with 23k hp. Resto shaman with 34k HP BE paladin with 22k hp. These are not miscalculations from addons - I hit them forever and forever (I'm a hunter) and they just regen to full and they are not being healed. They never die either I check the thing after the BG and they only have 1 or 2 deaths.
I'll post screenshots in a second