Europa Universalis III: Heir to the Throne is now available via digital distribution, announces Paradox Interactive. This expansion requires Europa Universalis III and the previous two expansions, and there's also a new Europa Universalis III Complete bundle with the whole package that's currently on sale on GamersGate. Here's word on content in the historical strategy expansion:

• Brand new Casus Belli system, where wars have specific goals from start to finish
• Monarchs now belong to dynasties, with new influence on the diplomatic model
• Increased Holy Roman Empire and Papacy options for more powerful ruling
• New diplomatic options for Merchant Republics
• Enhanced "Cultural Tradition" and recruitment of specific advisor types