I think they're the opening act for
Da Yoopers.
http://dayoopers.com/
That means they'll trade in the fancy tour buses for the rusty Chevrolets.
The two sisters would do well to trade in the donkey that won't stop braying for The Couch That Burps. They married into the liberal schtick that is Maines and now the McGuire sisters are singing the Three Month Late Polka.
I first heard the Yoopers on WLS when Lujack was promoting them (back when I had hair), some of their stuff is great.