The reason why I didn't post about him yet is because information is coming slowly.

+A/B/C: 1 hit snake arm, and can't link from weak attacks anymore. If charged to max, Yamazaki will do "Big Snake." Not sure if anyone would fall for that though.

+P: Knife slash, Yamazaki leans forward and does a slash. Recovers really fast so it's quite safe to do on block. And if the position is good enough it makes him safe. It seems that when he hits, he'll do an extra slash.

+P: Anti-fierball attack. B version sucks one in and if you repeat the motion afterwards, he'll throw one of his blood fierballs back. D version immediately does that instead of 'storing' one for you.

+K: Counter move. Same as normal Yamazaki.

,f+P: Grab move, exploding headbutt, same as normal Yamazaki. (Questionable since it's reported to be not with EX Yama)

+B: Overhead dust kick thingy. Same as normal Yamazaki. No sure if there's a D version.
d,d+B when opponent is down: OTG move. Stomps on opponent and Yamazaki laughs liek crazy, while he's laughing, I read that he's totally invincible.
qcfx2+P: Same as normal Yamazaki.
hcbx2+P: Same as normal Yamazaki, except that it can now go up to level 5. Level 5 requires you to press ABC when Yamazaki raises his hand once more. Note that when you reach level 3, you can just keep on mashing ABC together to reach level 5. Level 5 requires an additional stock.