well not quite, but sort of...
Source: DS-X2In a recent interview with Sega's Yuji Naka, it appeared that Sonic Rush will make use of the Nintendo WiFi Connection service.
In an interview by GameSpy, Yuji Naka revealed that the upcoming Nintendo DS game Sonic Rush will include a multiplayer option providing the ability to have other players download a competition game via WiFi. In the interview Naka also stated that the game will feature pairs of characters teaing up: Sonic has Tails, Blaze and Cream and finally Knuckles and Amy.