Swae Lee's highly-anticipated Human Nature album remains without a firm release date, but the Rae Sremmurd frontman promises the solo effort's arrival before September expires.Billboard's Chelsea Briggs caught up with Swae Lee to get a peek at his upcoming project, how he landed on Pop Smoke's posthumous album and the release of his boohooMAN collaboration."It's gonna be huge," the crooner proclaims of the Swaecation followup.