From Rolling Stone:
First Radiohead provided fans with two brand new songs, and now it appears frontman Thom Yorke is on the verge of doing the same: According to Canadian entertainment site Exclaim, Yorke will release a new 12?’ single carrying two new tracks, “The Hollow Earth” and “Apart By Horses” on September 22nd. As Rock Daily previously reported, Yorke recorded a song for the upcoming Twilight sequel New Moon, and judging by the timing of the single’s release, it’s fair to assume that one or possibly both of the songs are Yorke’s contribution to the film. The soundtrack’s first single, Death Cab for Cutie’s “Meet Me on the Equinox,” will debut September 13th, and the film itself hits theaters October 20th.
Sources at pressing plant Sonic Unyon, who are reportedly preparing the single, told Exclaim that the single has “really awesome packaging and artwork,” and that only a limited number of vinyl — probably less than 10,000 copies — will be made. The label handling the release is TBD Records, the company Radiohead created in a partnership with ATO for the physical release of In Rainbows. As Rock Daily previously reported, after a period of new material dormancy since the 2007 release of In Rainbows, the past month has seen Radiohead suddenly and secretly release a pair of new tracks, “Harry Patch (In Memory Of)” and “These Are My Twisted Words.”
While there’s not much information regarding “The Hollow Earth” — though the title conjures up some of the lyrical imagery in Yorke’s other recent new solo song reportedly titled “The Present Tense” — “Apart By Horses” does have some Radiohead history. Back before In Rainbows “Reckoner” was In Rainbows‘ “Reckoner,” a song bearing that name with the parenthetical title “Feeling Pulled Apart By Horses” was performed a few times at Radiohead concerts. As opposed to the melodic centerpiece that surprised fans when it appeared on In Rainbows, that original “Reckoner” was one of the more harder-edged, guitar-driven songs in Radiohead’s recent output.
Radiohead have often resurrected fan favorite live songs for eventual release—In Rainbows‘ “Nude” and IR bonus track “Last Flowers” date back to the OK Computer days—so it’s possible Yorke might be bringing back the original “Reckoner,” which he last performed solo at a Trade Justice Movement rally in 2005. (Rock Daily covered the tale of the two “Reckoner” in the preview and live blog of In Rainbows.)
(thanks to David)
As 
The dust is settling but there is still speculation and rumor-mongering about what exactly has happened over the past few days. For those late to the show, you should check out the recent posts here at GP to get you up to speed.