Nintendo have been pretty coy in confirming the name of their upcoming 3D gaming handheld - with president Satoru Iwata teasing that "the final product name shall be announced in the not-so-far-away future" - but it seems increasingly likely that they'll stick with Nintendo 3DS. That's one of a handful of newly filed trademarks from the company, including "3DS", "N3DS" and, interestingly, "3DSPlay" and "3DSWare".
The significance - or indeed purpose - of the latter two is currently unknown. However, given there is an existing game download service on the DSi called DSiWare it seems likely that 3DSWare will be used for a similar service offering 3D-compatible titles. As for 3DSPlay, there's speculation that it could be a mobile version of Wii Play, consisting of various mini-games for the handheld.