Haha bought 2 of the 6 month $10.99 cards from Bestbuy last night. Oh well I have 2 live accounts anyways so it not like its going to go to waste, in for one!
I bought this on the Collector's Edition day Amazon had a couple weeks back and can verify it does not come with Case Zero or any of the other DLC packs, though I did see the Zombrex Edition at Best Buy and it had a sticker indicating a token for the Sports pack DLC which goes for 160 pts on Live.