With festivals on the brain, time to check in and see what TBS has in store for the 2008 version of The Comedy Festival in Las Vegas, going it alone this November since HBO seemingly got out of the comedy confab business (still listed down low on the site as a sponsor, though). They’d already announced that Ellen DeGeneres would return with another variety TV broadcast at Caesars Palace, and now we see they’re bringing Jerry Seinfeld back, too, with other headlining slots going to Mike Epps, David Alan Grier, Russell Peters, Andrew Dice Clay and Tracy Morgan. Tickets go on sale Sept. 26. More info to come…