I'll try to put together an official change log when I get a chance but it's mostly been balance, ai and bug fixes since the beta. The biggest issues for balance were to impose a supply cap on cities and buildings to prevent huge supply caches and to put more emphasis on upgrading supply lines in order to move that supply. Also, cities and buildings will now push extra supplies when they reach their cap and units now have supply priority over cities so they won't starve when standing outside their own city.
Additionally, workers no longer use recruits to prevent them from being used as a recruit cache and they cost significantly more. Also, spearmen now take just 20 recruits for 30 men to give them more of an advantage for garrisons.
There are also a few more gameplay options to adjust difficulty and play style including recruitment speed, overall food levels, resupply methods, etc.