Nintendo Zone
Nintendo Zone is the successor to DS Download Stations, offering retailer exclusive content, game videos, screenshots, etc. This service does not have 3DS demos. USA Best Buy and some other retailers have NZone, this NZone seems to be significantly different from the DS(i) NZone. Most content available at Best Buy is already available on eShop, like the screenshots/videos, game info etc. The OK Go video is available from NZone however.
Like DSi, when an open 3DS detects NZone the hidden NZone title appears and a notification about it appears. Like DSi this title is already stored on NAND, it's just not visible until you're in range of NZone. When NZone beacons are in range, 3DS only detects NZone when not connected to Internet already.
Description
The NZone browser interface looks very similar to the main 3DS web browser, so it's probably the same as that browser except modified.(and with video support, presumably mobiclip) The NZone beacon encryption is same as before, except some unknown fields in the cleartext was changed where 3DS will only "detect" NZone when the beacons' fields are set this way. DSi will not detect these beacons. The Best Buy NZone uses the same authentication parameter at all stores /w NZone. Accessing the server via curl does not work correctly, the server returns old content. This is likely because the NZone title sends new/different params to the server.