Previous installments of the Halo series let you access your fileshare outside the game to queue downloads, and share files. I can't seem to figure out how to do this for Halo 4. I'm most interested in sharing files with others, ideally something linkable. How do I do that?
The answer, currently, is "You Don't" however after looking around on the Waypoint forums "The Little Moa" says,
so sometime in December, I would think.
EDIT, 19th December: I spotted a bit in the 12/12/12 Halo Bulletin where it says
So, keep waiting.
The official site for Halo 4 has become Halo Waypoint.