There's absolutely no way I can speculate, so I'll just throw a few ideas out and leave the rest up to you guys:

1. Why is the Hollow mask back again?
2. Byakuya's sword (you can tell from the hand) has no blade.
3. What did Yoruichi change into at the end of the last eps, a bigger cat, perhaps some spiritual tiger?
4. Despite everyone's Byakuya-love (same with Itachi-love from Naruto), Ichigo HAS gotten a lot stronger through his literally constant days of training with Urahara and the fighting experience (what Urahara was also teaching him) he gained in Soul Society. He did hit a proportionally weakened Renji way back in eps 16 and now beat him and Kenpachi. Ichigo *might* have a chance. But, Kenpachi couldn't release his sword, despite his massive power.