The LG Optimus 3D is a glasses-free 3D smartphone launching later this year (TBA) in the U.S. It has a 4.3 inch screen, that according to Engadget, works well.
I bring it up now, because it is competition to the 3DS (not in terms of gaming, but in terms of those who simply desire 3D and for whom glasses-free portable is a viable option) and two new features have been announced for it at MWC. One of which we know the 3DS does not have, and the other Nintendo has yet to mention, but also seems dubios at this point. 1. Video out over HDMI
2. A Youtube 3D app
So, obviously no video out over HDMI, but neither have we heard anything about Youtube 3D. It is likely that with the browser you can watch 3D videos on Youtube, but the purpose of the app is more for uploading video. Is Nintendo going to allow us to share 3DS video on other devices? Will there even be 3DS videos? Now, like one of the iPods or Phones they could do a firmware update that allows video, but in light of competition, Nintendo seems to have made a huge oversight with the 3DS's cameras, and sharing video. Could they really not afford to lose the $7-$15 per system it would have cost them to put better cameras on the 3DS?
For the first 6 months or so of its existence the 3DS will be a unique product, but when other devices like the LG Optimus 3D come out, the 3DS will be a step behind.
The reason I put this here and not in the 3DS discussion, is because this phone is just the first of what will be many competitors for the portable 3D market, but not in terms of gaming. For now, and the foreseeable future, Nintendo will have a lock on 'serious' 3D gaming, but I do think there are people who would have/will buy a 3DS just for the ability to watch 3D on the go. Nintendo has got to do some serious hustling if they want to compete on that front, a front that is sure to grow, even as they are the ones who prove it to be a successful market. LG also has a 3D tablet coming out that needs glasses, but you can still take and share 3D videos.