To me, it is obvious that Tousen is going to pull some vizard shit.
Also, calling it a much more powerful than a bankai makes SENSE as I've been trying to preach teh werd! The vizard form amped Ichigo up to well above his Bankai form, so obviously, it is "supposedly" much stronger.
I'll have to wait and see, though, as we don't know for sure.
What if it is a "3rd kind" of hallowfication/shinigamification? Meaning, what if it is like...I dunno, a pure form of shinigamification/hallowfication?What if it is something else entirely that is neither a hallow amp or a shinigami amp? What if it is a "hell" amp? You guys know I've been preachin' the word on an super-arch in Bleach that focuses on the hell portion, but I don't think Kubo is that fancy of a writer to mix things up like that.
We'll see.
And, that was a second form...not necessarily a second release. Ulq said himself that he's the only one with a second release, so we know Yammy didn't do a second release. He's just angrier.
My opinion....he has one more form above and beyon this one. Who's taking bets on it compressing into an ultra durable/fast form, similar to Ichigo's bankai?