UPDATE 12:19 p.m.: A spokesperson for Occupy Wall Street confirms "Radiohead will play a surprise show today at four in the afternoon. Press conference at one in the afternoon."
Update 12:54 p.m.: The OWS spokesperson tells Gawker they have no permit but the police are "aware" of the event. This is going to be interesting—a band with Radiohead's popularity can easily draw a hundred thousand for a free show in New York City. You need permits for this sort of thing, obviously, there are a lot of crowd control issues that are to be worked out in advance. However you slice it, this will be bananas. Press conference in 5.
Update 1:15 p.m.: Radiohead's management tells us that there's no concert for the protesters, but Occupy Wall Street insists it's happening.
Follow the up-to-date timeline here.