New Republic Dev Diary is out, as always worth a read if you are interested in the new DLC coming out.
http://forum.paradoxplaza.com/forum/content.php?1240-Crusader-Kings-II-The-Republic-Developer-Diary-4-Events-and-DecisionsThey are also releasing an update which will include:
Ultimogeniture Succession: the youngest child inherits
Tanistry: A version of Feudal Elective where the electors must pick a member of your dynasty, but will tend to pick distant relatives, preferably old claimants
Grant Independence Diplomatic option
Automatic cultural renaming of titles in your realm. So you'll automatically see Smyrna turn into Izmir if held by Turks, etc.
Added 1241 Bookmark - "The Mongols"
The Reign length opinion modifers are now dependent on how long a character has been the liege of someone, not how long the primary title has been held
All merc regiments now grow in max size over time
Added more mercenary bands: Finns, Lapps, Abyssinians, Nubians, Lithuanians, Scots, Irish and Alans