As jos235 noticed two days ago, the 2012 OFC Nations Cup matches are considered by FIFA to be World Cup qualifiers and not continental final matches. See the fixtures section on FIFA.com.
This affects the points awarded for these matches, as for World Cup qualifiers the multiplier is 2.5, while for continental final matches the multiplier is 3.
I wrote to FIFA about it and here's the answer:
2002 was the last OFC Nation’s Cup edition which was not also a FIFA World Cup qualifying tournament at the same time. After that we counted the Nations Cup always as World Cup qualifiers.
All matches from Round 1, 2 and 3 as well as the intercontinental play-off will be World Cup qualifiers.
I also asked them if the knock-out stage matches will be considered continental final matches, but they didn't reply to that question.