Omg I just realised what the next filler could be. We haven't seen much of Jiraya lately, so mayby their going to show when he uses his extreme peeping skills on Akatsuki. But that't mayby to close to the main story. I would also like to see some Jounin on Jounin action, that was a long time ago.
Also team "InoShikaChou" haven't had a filler yet, if I remember correctly. But they suck anyway. I mean, Ino with here useless ability "Mind-control-for-five-seconds-then-I-faint-no-jutsu" and Chouji "Make-my-hands-very-big-and-just-stand-there-no-jutsu" (wonder if he can make ALL his bodyparts bigger). The highlight of that would be seeing Shikamarau with his kickass "bitch-choking-no-jutsu" (man he could become an awesome serial killer/rapist).
The only thing I really wish they'd do if they have more fillers, is to put Naruto in a coma or something so we won't need see his stupid ass in yet another mission. The only thing that would make Naruto cool again is if he started summoning Kyuubi, that would be so awesome I would have to "relieve" myself.