While it's fair to say that Sonic hasn't had the best console career since his switch to 3D back in the Dreamcast days, the opposite could be said of his handheld history. The three Sonic Advance and two Sonic Rush titles are excellent 2D platformers which lead many old-school Sonic fans to claim that the GBA and DS have been Sonic's real home these past few years. So, with a new Sonic game that promises to be surprisingly good heading to the Wii, it's only fitting that DS owners won't me missing out. Sonic Colours is coming to the DS aswell.
Sega could so easily have messed up the DS version of Sonic Colours[/b] by going own the route so many other developers take. Developers like to trumpet the DS as being more capable than it actually is, and set about trying to make the DS game look as close as possible to the Wii game rather than focusing on the handheld's strengths. What this usually results in is a mess of polygons with shonky gameplay (see LEGO Star Wars) when the developer finally realises that, no, the DS isn't capable of matching the Wii, by which the time it's too late to start again. Sega isn't messing around with all that rubbish.
Instead, Sonic Colours is completely different from its Wii counterpart. While the Wii game is inspired by Sonic Unleashed and Super Mario Galaxy, Sega is sticking with what it knows best on the DS and keeping Sonic Colours strictly 2D. This means it'll play just like the Sonic Rush games, and with developer Dimps at the helm (The studio behind, well, the Sonic Rush games) it's more or less guaranteed that DS owners are set to be treated to another great Sonic game.
(.. There's more, but the rest just tells you about gameplay you already knew about.)