On Sunday, Radiohead bleached its Internet presence—its Web site faded to white; its Twitter and Facebook pages were scrubbed of content—a move so blatantly counterintuitive that acolytes knew to recognize it as a portent. The week prior, inscrutable paper leaflets had been stamped and shipped to some fans, embossed with the band’s toothy-bear logo and the words “Sing a song of sixpence that goes / Burn the Witch / We know where you live.” A new album: it is surely nigh.