Halo 4 was set to make its first public appearance at next week's E3, but someone may have beaten them to it.
A new YouTube video purports to be footage of the new Halo 4.
A link to the video first appeared earlier today on the NeoGAF forum, but the video was quickly taken down at Microsoft's request. Unfortunately, it wasn't taken down fast enough because copies started popping up on other YouTube channels.
Judge for yourself if this is the real McCoy, before it's taken down again, of course.