He will probably do three or so songs, just him and his guitar.
I'm not crazy about him doing solo stuff as part of their show, but as long as he doesn't do ggw's favorite song, "come around", it will be tolerable.
And for whomever was dissing Murry...stop now. His two tracks are two of the best things on the new record, and if it weren't for Murry, Old 97's would probably sound a lot more like Matchbox 20, or a faux Bowie inspired Brit pop band. Rhett may have the looks and the moves, but Murry has all the taste.