"I'ma tell you this: I went to the OVO Festival the other day…the Drake concert in Toronto, he has it every year, lots of special guests. Rick Ross was there, Meek Mill was there, Nicki Minaj was there, Snoop was there, The Weeknd was there, A$AP Rocky was there…I did have a conversation with somebody that was there, and they did confirm they will be on Dedication 4. There's a lot of names, so it's on you."
I'm pretty sure Blac Chyna is there because she mentions her in the verse.
