i mean he was off paneled. all we know is that it freezes shit, which is the same thing her shikai does. needed more of an explanation.
Well by the looks of the panel and from she explained when she first started this fight. I think her Ice Zanpaktou is akin to Yamamoto's fire shikai/Bankai. Where as once her body temperature falls below absolute zero, anything her blade touches is instantly frozen and shattered.
When she released her Bankai, from what I gathered, the entire area around them instantly froze. It's a much more grand feat, in appearance at least, than Hitsuguya's Bankai in that everything around her, Buildings, people, the air, the ground, are instantly turned to crytaline ice. I wouldn't say her Bankai is as powerful as Hitsguya's as she just learned it. But it's definately flashier.
This is my theory anyway. I don't think Rukia is blonde here either. Her temperature reached Absolute Zero, and she is hailed in soul society as having the most beautiful Zanpakou upon release.
I think what we are seeing is an all ice version of rukia (think iceman)
That's my guess anywow.