You won't find very many details about the Halo 4 here. In fact, to be honest, there are none. It does, however, give you some insight into the number of talented people who are working on the game.
In the video, you'll see people with backgrounds from Rare, Electronic Arts, Pixar, ILM, Kojima Productions, BioWare, iD Software, Retro, Ubisoft, Rockstar, Valve, and of course some folks from Bungie. It's a team full of talent, and it makes Halo 4 all the more worth getting excited about.