[Edit] He just told me he was a brewmaster. Makes a bit more sense, but he could really dish out the hurt too. Still, healing through basically everything I could toss at him was wild.
Just got finished a few duels on the newest beta patch and WOW, windwalker monks have some insane self heals going on. Basically impossible to whittle them down on my spriest, it was a stalemate for about 6 minutes before I finally gave up and just /sit.
These guys self heal more than blood DKs used to, it's really quite a sight to see. Not sure if it will make it to live right now, but 1v1 they're basically unbeatable if they're any good at all.