343 Industries is planning to reset everyone's matchmaking rank. It will happen after they fix the bug that makes people hit maximum rank after playing games online. So just enjoy any matches you can get into if you prefer the Halo 2 Anniversary playlist; and don't fret over your rankings just yet.
I got a free physical copy coming today. I pre-ordered from the online Microsoft Store on the 9th and didn't receive it launch day, so I requested a cancellation so I could just pick up a copy in-store. After it was canceled at 3am on the 12th when the order was still "In Processing" I got an email saying it was shipped 6 hours later.