Any rule changes in the Sporting Code for Gliding take effect annually on 1 October.
They will be posted on
http://www.fai.org/gliding earlier than this, so that people can see the exact wording that will apply from 1 October 2002.
As has been discussed elsewhere in this newsgroup, one change that IGC agreed at their meeting earlier this month was that the earth model for distance measurement will change from the sphere to the WGS84 ellipsoid.