Koei Tecmo has now taken the original video offline, but many mirrors have already been uploaded, one of which is included in this article.
Well, it seems someone at Koei Tecmo needs to re-take YouTube Management 101, as a video has been posted unlisted - but available - that reveals Hyrule Warriors for the 3DS as an E3 announcement.
In a surprising turn of events it looks incredibly similar to the Wii U iteration, but with clearer character outlines and cut down world detail. In addition, Tetra and the King of Red Lions will be new playable characters, and will be transferable to the Wii U version. It's being branded as 'All Stars' - at least in Japan - which suggests that it'll include previous DLC characters in the core game, with the box art on display at the end of the trailer reinforcing that prospect. It appears to have the same main campaign as on Wii U.
Are you pumped to see this coming to the 3DS? Let us know.
Thanks to all that sent this in.