Sonic Colors (Wii version) is coming out next month, and people are comparing it with Sonic Unleashed, but I've noticed it has more in common with Sonic Rush. It actually looks like Sonic Rush in 3D; the stage designs are very similar, the music in both games is catchy and upbeat.
As for the DS version, it basically IS like a "Sonic Rush 3". It's made by Dimps, the same team that created the Rush games, so of course it will share many similarities. I'm mainly comparing the Wii version of Colors with Sonic Rush.
What do you think?