Over at Comics Continuum I got this information on what could be Joe Madureira's secret Marvel Project.
TORONTO -- Marvel Comics staged a Cup O' Joe panel without the Joe Saturday at the Canadian National Comic Book Expo on Saturday.
Editor-in-chief Joe Quesada was a no-show for the panel, but consultant/talent liasion/former editor C.B. Cebulski took center stage, answering questions in a lively session.
He was asked about on separate occasions who the creators of the third volume of The Ultimates will be and what Joe Madureira's project with Marvel will be, Cebulski said "You'll see in four days" to both, referring to Marvel's upcoming announcement. He wouldn't connect the two, however.
This news, along with rumors and an email I got from a fan who got Wizard #168 early all seem to point to the Ultimates Vol. 3 as Joe Mad's Marvel project. But, again, we will have to wait for Wizard #168 for the final answer, check back in three days for the official news!