Some guy did that maths in GAF.
360 Nov YTD: 5.5 million
+ "over 1.7 million"
= 7.2 ~ 7.3 million for 2011.
"More than 2.7 million ahead of 2nd place"
2nd place: 4.5~4.6 million
Nov PS3 3.6 million => at most 1 million for Dec
Nov Wii: 3.5 million => at most 1.1 million for Dec
Nov 3DS: 3.2 million => at most 1.4 million for Dec
Remember these are heavily rounded numbers.
Edit - MS never talk about handheld... so I'm removing it.