According to concert industry bible Pollstar, both the legendary Willie Nelson and Texas country artist Pat Green have been confirmed for the Manchester, TN festival. Willie on Friday 6/13 and Pat on Saturday 6/14.
If I remember correctly, Willie was supposed to play Bonnaroo in 2004 but he had to drop out due to carpal tunnel syndrome. He was replaced by Steve Winwood. I tried to enjoy Winwood's set that year, but we were getting clobbered with rain at the time.
Nice to see that Superfly/AC are finally getting Willie to the farm.