It's back now, and it has a firm release date of November 20th. If you have access to the 1seg digital audio/video broadcast system (which means you live in Japan), you can use this device to receive programming! You can also write notes and save them, which can be useful for sports scores. Nintendo will be selling this exclusively online for 6,800 yen ($59), and preorders start November 8th.
The sudden resurgence of this accessory was predicted by the Japanese magazine Gamelabo, whose predictions are usually not worth caring about. However, since this one turned out to be true, it may bode well for the other rumors they mongered in that issue: a new Square Enix RPG for DS starring Shonen Jump characters, and a PSP version of Dragon Quest IX. Or it could be that Gamelabo has a strict lies:truth ratio they have to keep up.