Eminem called in to Hot 97's Cipha Sounds & Rosenberg show this morning to make a pair of pretty big announcements. First, he revealed that Slaughterhouse has joined the already-stacked lineup for this year's Summer Jam. That's good news for fans of the four-headed machine, of course, though that wasn't all Em had to say. He announced that he's "started to toy" with his next solo album, which will serve as the follow-up to 2010's Recovery. You can listen to the interview below.