For all the information on these changes, click the links below.
http://www.rfu.com/thegame/~/media/Files/TheGame/Regulations/RFU%20Regulation%2015%20(1213).ashx
http://www.rfu.com/thegame/~/media/Files/TheGame/Regulations/RFU%20Regulation%2015%20Appendix%201A%20(1213).ashx
http://www.rfu.com/managingrugby/newrulesofplay
http://www.rfu.com/managingrugby/~/media/Files/2012/ManagingRugby/new_rules_of_play/Information%20Leaflet%20New%20Rules%20of%20Play_V2.ashx