Sonic Riders Producer Takashi Yuda has stated in the Vol.201 of Nintendo Power about a sequel, "To be honest, my knowledge about the technology of Revolution is not adequate to provide my deep thoughts, but I feel it could potentially take Sonic Riders to the next dimension based upon the information I currently have."
Who cares what 3D Realms says anyway? The guy hasn't even touched the controller and he suffers from "Gamecube is kiddy" sickness. Almost all developers are thinking the same thing, that they can realize there games in ways not possible before on other systems. Sonic would be a very good example of this.