http://www.icy-veins.com/blade-lord-ta-yak-detailed-strategy-wow
http://www.youtube.com/watch?v=3jsBOopW-yo&feature=relmfu - 25 man video
2 tanks. No idea about the healer/DPS requirements.
Phase 1: Lasts to 20%. When he marks a player and vanishes, stack on that player since he'll reappear after 5 seconds and do a meteor-cleave thing. Otherwise stay spread out to mitigate damage from Wind Step (slashes a random player and everyone in 8 yards, leaving a hefty DoT). Also there's a tank-swap (Overwhelming Strike; swap off every couple of stacks?) and some tornadoes, but the tornadoes move pretty predictably on normal so they shouldn't be a problem.
Phase 2: Fight turns into Booster Hill from Super Mario RPG. No, seriously. He'll run to one end of his hallway and throw you all to the other end, and you have to run towards him while dodging tornadoes. Eventually he'll switch sides and repeat.
This fight is more of a DPS fight than Vizier Zor'lok. Mainly because of the soft enrage mechanic where he stacks a damage buff on himself the longer the fight goes on. Getting through the first phase faster will be good, so we'll use Heroism early on. Other than that, it's mostly about collapsing and spreading out, then mastering the wind tunnel.
For Science!
A read through the comments on Icy Veins and pulled out a few things that we were wondering about last night.
1) stampeding roar is good
2) leap of faith works to get people out of tornadoes
3) when you get the boss to about 11% all of the dps and 1-2 healers should jump into the slip-stream to go to the other side and leave the tanks with 1 healer to run back.
At least one person recommended going with 2 healers because healers are so useless in phase 2. I know that I felt pretty useless. I was trying to stop and cast heals while running back, but that just meant I died before I made it to the platform. I could probably be more useful just running to the platform and then healing like crazy. My healing was also really low during phase 1 because a certain disco priest was bogarting all the heals. So basically I'm saying I was useless for this fight :).
If it is correct that there is no enrage timer on this fight, then we really just need 1 healer, 1 tank and 1 dps to make it through the tornadoes 2x. Also I found that stopping before jumping on the platform to assess where the tornadoes are going to spawn will prevent me from getting sucked up at the last minute. I will try to put my teleport thing at the end of the first tornado run and see if I can teleport up there. I have not done this successfully yet.