Rumor: Microsoft preparing a collection with 30 Rare classics titles
The collection might be Rare Replay and according to the site would contain the porting in HD games like Battletoads (NES), Jet Force Gemini (N64), Banjo Kazooie (N64), Kameo (360), Perfect Dark (N64/360) and Blast Corps (N64), as well as many others. It would probably all "direct" porting in high resolution, with no special graphic improvements compared to the original versions.
The site has also received a picture of a monitor of the GameStop chain where the game is listed as "Battletoads" RarePlay/Kit: the presence of that "Battletoads" Kit might suggest that the game could be launched in digital form with a set of free games, while others may be sold separately in special "kits" or "Ultimate package" as experienced already with Killer Instinct .
For now they are just rumors and we don't know how much truth there is, but fortunately we don't have to wait long: to Microsoft 18:30 for the Conference!