1) Mayuri probably already knows about Ichigo's Quincy heritage by now, however I think the analysis of his Zanpakuto will yield some interesting new information.
2) SS should hurry up and bring Orihime to fix up Byakuya and Kenpachi.
3) Byakuya staying alive was unexpected, but I am (personally) glad he didn't die.
4) As I've observed before, Ichigo hasn't AFAIK gone into his inner world to meditate with Zangetsu. Whatever he finds in there should prove very interesting.
Bleach has gotten more and more interesting for me lately. (Kishi better watch out)