The chapter was nothing special apart from Aizen getting blown away by Issin and Ichimaru using his Bankai. I can't begin to imagine what Gin's banki is. His Shikai has no obvious way of being able to improve or go Bankai. What I am almost sure of is that it's not going to be a "materialization type" like Kamamura or Kurotsuchi, and I don't think it's "kidou" type either. Im thinkin dirrect attack type- but we shall just have to wait and see.