A Neowin forumite has produced what he claims to be a picture of a document faxed from a friend who works at Mandarake Galaxy, detailing a Kingdom Hearts 358/2 Days/DSi bundle for Q2 of next year -- which is after the just-announced February release date for 358/2 Days. But that's not the really interesting bit -- in fact, we fully expect such a bundle will show up.
No, the interesting bit, which makes us fully doubt this, is that according to his translation, the bundle will include not only 358/2 Days, but Chain of Memories as well -- and that the included DSi will include Game Boy Advance compatibility.
Due to the quality of the picture, we can't make out a lot of the kanji, but we can clearly see mentions in katakana of Kingdom Hearts 358/2 Days and the Game Boy Advance. Kingdom Hearts: Chain of Memories is written out too, but not correctly. It doesn't matter what it says, in the end, because this is a picture of a page some guy typed.
In real Kingdom Hearts news, Gamespot has a hands-on preview of 358/2 Days, describing in detail a playthrough of the TGS demo.