You can find details of that penalty system here, but essentially, expect to be fined currency or experience of an equal value to the match you abandoned/didn't do anything in (with a few exceptions, explained in the linked post). Also in the update: more higher-def vehicle models, balancing, and improvements to the newly implemented Strongholds mode. You can now employ Legionnaires (these are players unaffiliated with a clan), and construct a War Department, i.e. "a building which will give random quests" to your fellow clan members.
Here's all that again, in video form:
Ta, PCGamesN.
