I don't think that's the case. Uliquorra's second form is their form of Bankai. Their "releases" are the fusion between them and their swords. When a Shinigami releases their sword, they get Shikai and Bankai. When an Arrancar releases their sword, they fuse with it creating these power forms. It was only natural that Arrancar would be able to have a 2nd release because it's their swords second release.Originally Posted by NeoCybercoin
This doesn't hold true to Vaizards. Vaizards are shinigami first, so their swords will go into Shikai and Bankai forms. There shouldn't be a second vaizard form as in the way of Uliquorra. While it's possible there is a second form, it's not because of the same reasons.
Either way, I honestly believe Ichigo died, and he's somewhere between an arrancar and vaizard. Not quite either, something different all in its own. He's definitly more Hollow than before, as seen with his use of a Cero.