It's official. Rare is working on a DS title and that title is Diddy Kong Racing DS. This would probably explain the lack of information surrounding the game on Nintendo's site.
E3 '06 is also the debut stage for our latest collaboration with Nintendo: we've possibly hinted at it in the past, but then again we've also hinted at a lot of other things, because we're like that. Yes, Diddy Kong Racing is our first official DS project, and Nintendo are busily promoting it as part of their next wave of big DS offerings for late 2006. Based on the N64 classic but improved and expanded in ways that only the DS allows, you can see the first shot and movie snippet over on NCL's website if you haven't already.
A few tantalising DKR DS info-bites to keep you going: eight-player single-card and multi-card WiFi play, touch-screen and microphone compatibility, some familiar faces in newly playable form, remodelled and retextured tracks, customisable vehicles, new modes, weapons and challenges, a little something called TT's Wish Races where you can create your very own tracks... and it doesn't end there.
Source: www.rare.co.uk
Many thanks to forum member Rugal for bringing this to our attention.