If you've already pre-ordered your copy of Halo 4, this thread will mainly show you what you are missing out on, and maybe that you made the wrong choice. If you haven't yet, make sure you get your pre-order in soon. It launches in just under 4 days.
Best Buy/Mighty Ape
Microsoft Store/Mighty Ape
So if you haven't Pre-ordered already, make sure you do and grab the skin you want.