Big Sean has a lot on his plate these days. The Detroit rapper unveiled a brief teaser tonight to officially announce his new mixtape, Detroit, the fourth installment in his Finally Famous mixtape series, which drops September 5. 

He also hit Twitter to talk about the follow-up to his 2011 debut full-length, Finally Famous, which he says will be coming out before the end of the year. And he touches on the G.O.O.D. Music compilation, which is due out September 18. Watch the teaser above, and see tweets below.