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When this was revealed, we all assumed it was Yachiru's Shikai. Because, you know, she said a thing and then her sword got awesome. It made sense.
Now, Yachiru is Nozarashi? What does that mean Sanpo Kenju is?
I've heard theories that it's an extention of Nozarashi's powers, or that she's calling for some other Zanpakuto Spirits to come and curbstomp her enemies for her, or that Kenpachi is just so badass that his Bankai can go Bankai. What do you think?
Maybe Kenpachi's Bankai is going to summon a bunch of giant monsters to beat the crap out of Gerard. (Which would be kinda awesome, but also literally Komamura's Bankai.
All we know for sure is that the Sanpo Kenju monster with the cleaver is the most adorable and huggable thing ever.