I read the official press release and there are a few interesting tidbits:
1. StreetPass will transfer Mii data, as well as custom characters from other games, high scores, and maps, which I'm assuming are custom maps but it did not say. There's no mention if something you transfer to one person can be transfered from them to someone else, but hopefully there is, as we've discussed here.
2. Face Raiders "game" will be included in system so you can shoot at funny depictions of your face. The press release says your face, but you can use just about any picture.
3. There's an app called "3DS Sound" which lets you manipulate sound, and will also play MP3s and AACs normally.
4. There will be 3DS prepaid cards to purchase DSiWare, VC, and other content. I'm wondering why/if the prepaid cards are 3DS specific when general and refillable Nintendo cards would be best.
5. This the most disappointing: OoT, Star Fox 64, Kid Icarus: Uprising, and Paper Mario are NOT launch window games. The launch window according to Nintendo is from March 27 to E3 in early June. SteelDiver and Pilotwings are launch window games. I'm assuming that like Japan, Nintendogs + Cats will be the only 1st party launch title.
In their impressions, Engadget notes that each game required different 3D settings from the slider, and that Madden looked jarring to them no matter what they did. They also said two of their staff got headaches from constantly switching the 3D between games. They also made mention that the viewing angles in 3D were bad, which is strange because I think I remember them saying from E3 that while moving it did ruin the effect, it wasn't terrible.