...you're not getting one. Seems there's been a misunderstanding somewhere along the line, I was expecting it to start soon, and in researching the subject found that it's actually only a double XP weekend - however the variety map pack will be cut price for the entire week.
Source: Infinity Ward PS3 forums.
There goes my hopes of levelling up 2/3 prestiges in one quick week. At least the game won't be one big lagasm for too long, it's bad enough already with the crappy matchmaking.
In other news, add me to your PS3 friends list if you fancy a game soon.