Well looking in to our next Episode titles ANN has this

2006-04-11 77. Vanishing Grudge! The Shinigami that Kenpachi cut down
2006-04-25 78. Shocking Revelations for the Gotei 13 divisions!! The truth buried in history
2006-05-02 79. Yoshino's decision of death
2006-05-09 80. Assault from a formidable enemy! A tiny final line of defense?!

So other then that any guesses on what we are going to be seeing?

Something about that deserter Shinigami, and possibly his end?