The International Rugby Board announced last month that a number of law amendment trials will be enforced immediately.
To clarify exactly what the law variations mean and to clarify, the IRB has created resources to help all rugby stakeholders understand the changes.
These resources can also be found on the Referee Resources Center.
Law Amendment Trials: http://www.irblaws.com/2012/
Enforcement of current Law: http://www.irblaws.com/EN/guidelines/5/enforcement-of-current-law-june-2012
Five Key areas of Refereeing: http://www.irblaws.com/EN/guidelines/4/five-key-areas-of-refereeing-june-2012/