Though we've only heard word of the Wii version of GoldenEye 007, developer n-Space has confirmed via its Facebook page today they're working on a DS version:
One parting announcement... at E3 this year Activision and Nintendo announced GoldenEye as a Wii exclusive. Not quite. We're happy to confirm that a DS version is in the works at n-Space. More on this next week!
If you don't know n-Space, they've long worked with publisher Activision on portable and Wii versions of titles like Marvel Ultimate Alliance 2 and Modern Warfare, the latter of which was particularly well-done and received. As such, this is probably one you want to keep an eye on.