Update: Not that there was a realistic chance of them replacing them, but now it's official. The Yeah Yeah Yeahs have filled the spot. (Thanks V)
Original story: The Decider lists The Cure amongst possible replacements for the Beastie Boys at the Austin City Limits festival. Just pure speculation, and very unlikely. (Thanks Monghi)
But just for fun, you can go here (picture #21) and vote for The Cure to be the replacement.