The band performed acoustic versions of both its own hits and some surprising covers.
The album will also be issued as a two-CD set with 33 tracks, and a four-LP vinyl version -- as well as a digital download.
Idol announced a 15-date spring residency in Las Vegas at the House of Blues.
They hope to have information about the possibility of rescheduling this date very soon.
The new collection is due out in 2017.