Gannin Arnold, Jimmy Chamberlin, Billy Mohler
Well, according to this (now tight lipped*) poster on the official and Absolutely Ground-Breaking SP.com messageboard, Mohler and Chamberlin worked on 3 new Complex songs back in November last year... Makes sense as this was the time members of the Jimmy Chamberlin Complex (Jimmy Chamberlin, Billy Mohler and Gannin Arnold) got together to play for the Drum Channel for Gannin's solo record and the 'Art of Drumming'
*sort of ;)