Google Alert came up with a couple of presentations on the changes in the Racing Rules of Sailing.
The first one is by USSailing via the Florida EC-12 Association:
Changes to the Racing Rules of Sailing for 2009–2012
The second one is from Bill Kirkpatrick: Changes to Racing Rules of Sailing 2009-2012
Both presentations are written for the USA, with references to some of the prescriptions. Nevertheless, a good point to start to learn what is new.