It does not look like a DS game. Its a bit better, but that is about... what 95% of 3DS games look like in quality. I don't think users here should be like "FUCK YOU SEGA LOOKS LIKE SHIT!" what do you expect from the software when the hardware isn't all that great?
Also noticed that NO fucking games on the 3DS run AA, so they look jaggy as hell.
Nintendo DS:
I would like to wait for new screens of Sonic Generations, but I can tell you this. It will look better than New Super Mario Bros and most likely be designed way better since that game was designed by 8 year olds.