To switch to the test branch, right click Old World in Steam and select Properties, open the Game Versions & Betas tab and select 'test' in the version list.
Forts cannot be adjacent to other Forts
Increased defensive modifier of Garrison/Stronghold/Citadel by 10%
Lowered The Gatherer and The Resourceful cognomen levels (from 30/50 legitimacy to 20/40) and values (300/100 for harvest/chop to 200/50) (Empires of the Indus)
AI builds fewer Militia, Conscripts and obsolete units
AI places a lower priority on attacking expansion targets if it's short on orders
AI always guards city sites even when it believes no other player is nearby
Improved display of rivers on tundra tiles
Added Pillaged filter for Improvements in Map Search
Unit type help improvement
Cut down on character life event announcements
Random traits and ratings are now only shown in the turn summary for the leader and the heir
Religion conversions are only shown for leader, heir, family heads and the first character to convert after founding
Fixed some bugs with AI movement
Fixed loading save with no settlement improvement on a city site
Fixed cycling through Map Search results
Fixed team alliance contact inconsistencies
Fixed unlimber audio overriding subsequent selections