The Japanese Nintendo YouTube channel is pretty consistent with weekly updates, and the latest batch are all entertaining in their own ways.
Our favourite is a musical rendition of the main Splatoon theme using Daigasso! Band Brothers P, a neat 3DS game / app that sadly hasn't made it to the West as yet.
Next up is a video for Devil's Third, which provides a particularly good look at the variety - and quirky madness - promised in the online multiplayer.
Finally there's a trailer for the equivalent Japanese release of Ultimate NES Remix on 3DS; this one's just nice because we like retro games.