Funny how so many Sony fanboys get irritated by baseless rumors of MGS4 going 360, yet have no trouble whasoever believing the PS3 will cut its price by $200-300 by this Christmas.
If PS3 sales continue as they have, maybe a little accelerated for the price drop/fire sale, it should be between 5-6 million by the time we hit November. I'm not sure it can sell more than 2-3 million during the holidays, though.
The 360, if it has a price drop (and it damn well should), I can see at 11-12 million before the holidays, and selling another 3-4 during, since it should have plenty of supplies and $100-200 on the PS3.
The Wii will only be contrained by supply. I have to assume there is some stockpiling by stores and by Nintendo, but how much is anyone's guess. At current rates, it should add another 3 million by November, getting it to 11 million (more than that if supplies allow, partly due to the release of Mario Galaxy). If there is no supply boost, it'll just add 2 million during November/December, but if supply lines open up, I could see up to 5 million added on.