To go along with the release date announcement, Nintendo put together a humorous image of a gorilla playing a 3DS. We already know what the game looks like from its original Wii release, and you cannot convey a 3D upgrade through screenshots. So, the gaming gorilla and his pal will have to suffice.
The SRP for the Wii version of Donkey Kong Country Returns 3D is currently set at $29.96. There's no price on the new 3DS 3D version, but I'd be surprised if it came in at or above the Wii price.