Track #15 on the standard edition disc features Jill Scott, Bilal, Anthony Hamilton, Algebra, Chrisette Michele, Shelby Johnson, Ledisi, Citizen Cope, Dwele, Chico DeBarge and Rudy Currence. Boom.
Also, above is the artwork for the deluxe edition, slightly different from the standard. Listen to 30 second snippets of each song here.