I reckon, as we saw, both sides represent different sides of Ichigo's soul. Therefore, one side will be Ichigo's Hollow/Shinigami side, with a Getsuga Tenshou kind of attack, the other being a Quincy, possibly Seeleschneider type attack. The gap in the blade too? Anyone else think that'll fill up with spirit energy, either blue like a Quincy or another color, like a Cero?
Still got so many questions. I wonder what Kenpachi, Urahara, and Shunsui's Bankais are like? I wanna see Yoruichi return. What's going on with the Fullbringers? I want Orihime to fight or have new powers/forms, same with Chad. I wanna see what Mayuri's making. What about Grimmjow/Tia? What's going on with Uryu?
Oh so many questions. It'll be years before we see the end