An important point about the new test scoring system, from the JLPT new test guidelines executive summary at
http://www.jlpt.jp/e/about/new-jlpt.html:
"The requirements for passing have changed so that examinees must now exceed the minimum acceptable score for both the total as well as each scoring section. Failure to exceed the minimum acceptable score in any scoring sections will result in a fail for the entire test, even if your total score is above the minimum acceptable score. The purpose of setting a minimum acceptable score for each scoring section is to assess the comprehensive proficiency.
The minimum acceptable score for passing both the total score and each scoring section will be announced in 2010."
As far as I know, they haven't announced those scores yet.
But reading between the lines, it may be possible that new overall pass rate won't be 70% anymore, and in any case the individual section minimum score could be (I would say almost certainly will be) less than the overall pass rate. If you look at the distribution graphs of the recent test scores, a very high percentage of the passing scores are in the 70-75% range. In other words, most folks who pass are just squeeking through. And I'm guessing a lot of those folks are stronger in some areas than others, so they got less than 70% in their weak areas, but made it up in their strong areas.
So unless the JLPT test makers intend to radically reduce the pass rate, the individual section minimums will probably be lower than the overall test pass rate.
Another interesting thing in the executive summary is that JLPT will not be releasing official test questions until 2012. They have test sample questions at the link above, but they are kindergarten level compared to the current 1級. They give you an idea of the new test question formats, but not a realistic idea of your chances of passing the new test.