The 2012 revised edition of Guards! Guards! A Discworld Boardgame follows basically the same format as the 2011 first edition with a number of cool amendments.
Firstly and most importantly the Rule Book has been completely restructured, FAQs from fans have been answered, lots of really helpful diagrams have been added and a 'What a player can do on their turn' page at the back of the Rule Book is an excellent inclusion.
In addition there have been some clever minor rule amendments. The first one being when a Dragon is summoned it is placed on a Guild House and then may be made to interact with the Luggage. The second one is that players can now purchase additional Attribute Points to boost their Character and make it easier to win. The final change is on Final Spell rolls. If a player succeeds with one of the two rolls on the first attempt, they do not have to re-roll for this target, only the failed target roll on their next turn.