Musically, I don't expect nothing new or interesting from MP, but I'm sure that he'll give to the fans a lot more than we have had during all these years in every other aspect.
Honestly, I was more excited when he left than now, but the rest of the band hasn't filled the 'hole' during all these years.
On the other hand, AVFTTOTW is, IMHO, the best thing they have done since SDOIT or TOT, so I'm a little bit disappointed with the fact that they have got rid of MM.
Anyway, interesting times are coming for sure...