Speculation has The Cure on Friday, Janes Addiction & Flaming Lips on Saturday, and The National on Sunday. Not at all confirmed, but let's hope it's true, as Friday night has the latest curfew.
Update (07/23/14): Not happening today. Their official statement is "they will be released about the same time as last year". Last year it was July 24th.
Update (07/24/14): Looks like it could be today. Unless they're just messing with our heads. :)
Dear Chicago, if there was one SINGLE thing we could let you know toDAY, what would it be?
— Riot Fest (@RiotFest) July 24, 2014
And from their Facebook: "Dear Chicago, we have a SINGLE announcement for you a little later today. Keep an eye out..."