Perfect Dark Zero Map Pack Confusion

It seems that more than a few people got a email today from Microsoft/Rare stating that there is a Perfect Dark Zero map pack available for download. Well according to Major Nelson you can stop looking for the download on the Marketplace because the map pack is not even there. Apparently a mixup happened an the email went out before the maps were even ready to go live. Infact there is still no set date for the PDZ Map Packs to hit the Marketplace so you now have sometime extra time to contemplate and save up for those 500 Microsoft Points that the download is rumored to cost.