Hard to speculate on what MP will do. He seems pretty bitter about the break. I can imagine scenarios where he listens to the album and refuses to comment, and I can imagine he'll listen to the album and call the guys and congratulate them, without commenting publicly, and I can imagine he focuses so much on AM around the 13th that he doesn't get the album at all.
I would say the second scenario is the most likely. He might extend an olive branch to mend some of the bad blood. Though he'll not get back into the band, I think he'd want to be in contact with the band again, if he's not already (still?)