Features:
-new interface and graphics
-a whole range of new traits gainable both through education and dedicated events
-new guelph vs. ghibellines system, with related traits, historical characters and events
-a new and more accurate set of both historical and randomly generated coats of arms
-more than 100 famous historical characters fully implemented with a chance to welcome them to your court
-new holy orders creation system and many new orders and mercs
-heretical religion heads and smarter heresies
-new templar system
-lots of new flavour and everyday life events
-extended grand hunt and new ball decision
-jewish communities and religion fully implemented, with three separate cultures (ashkenazi, mizrahi and sephardic)
-many new cultures and 'melting pot' events
-lots of new decisions to implement historical reforms in selected kingdoms and empires
-many new plots and ambitions
-more religious depth with many dedicated events
-many more intrigue and romance opportunities and dedicated event chains
-many new everyday and historical decisions
-completely new building system
-many new bookmarks
-extended map with more provinces
-new education system
-many new kingdoms and empires
-more economic flavour with the addition of the maritime republics and the hanseatic league
-deadlier wars and sieges with dedicated events and decisions
-new cardinal and papal election system
-many culturally differentiated laws
-new dowry on marriage system
-new peerage of england system
-new fealty and civil war system
-new combat tactics and many battle events that influence the outcomes themselves
-many relic dedicated events with hunts for the grail and the shroud
-general effort to achieve balance, realism and immersion