From the CoD website:
“1. VIP members (former CharlieOscarDelta users / early sign-up’s.) If you are a former CharlieOscarDelta member, make sure you transfer your account!
2. Community members based on when they created their accounts
And of course, if you pre-order a copy of CoD: WW at GameStop (and are in the U.S.) you have another chance to get your spot in the Xbox 360 MP BETA, so not to worry.
PC players, your BETA is coming up! Stay tuned and keep checking CallOfDuty.com for updates coming shortly.”
As for the release date, I don’t think one has been confirmed (November 11th has ben floating around as a tentative date), although I’m sure that it will be released in time for the holidays.