For this week at least, it's former Washington DC morning Jack Diamond. Robert Feder reported that he's going to be getting the gig, replacing Brant Miller, and reducing Brant's role back to weatherman.
Tom Taylor said this in his column this morning: "Jack Diamond seems to be getting at least a hard look from Cumulus as the potential new morning talent at Chicago’s classic hits WLS-FM (94.7)... Jack’s living in a hotel in Chicago, seeing if WLS-FM is a good fit for him."
Diamond said this on Facebook: "I am having an absolute blast in an amazing city, on a truly great radio station, with some of the best people and personalities in the business! What's not to like!...It's been a lot of fun and a career-long dream to hang with these guys, Chris Roth. Greg Brown, John Landecker, Brant Miller, Danny Lake, Dick Biondi, Marti Jones. Amazing talent and good people."
Sounds to me like he's coming aboard.