Yes, this is a real thing and not some fan video. If you've always loved Halo except for the part where it's insufficiently cube-ish and customizable, today is your day, as you can download a Minecraft mash-up pack from Xbox Live.
The Mash-up pack, expertly crafted by 4J Studios, includes a "Halo"-themed texture set, themed menus and user interface, craftable items and 31 music tracks across the "Halo" franchise. Also available are 40 pixel-perfect character skins depicting beloved "Halo" characters such as the Master Chief, Cortana, Sergeant Johnson, Arbiter and more. For fans looking to fully immerse themselves into the "Halo" universe, the "Halo" Mash-up pack also features pre-made worlds such as Silent Cartographer, Sandtrap, Valhalla, Blackout, Guardian, Blood GulchI have to admit, the trailer achieves the rare feat of making the world of Master Chief look kinda...cute.