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.
Initial leader death immunity changed to 30 turns on Lengthy Mortality and 10 turns on Realistic Mortality (from always being 20 turns)
Moved some AI functionality from Ruthless AI to Competitive AI Aggression Level: Stealing Cities and Sites being attacked by other players, shorter grace period before building Wonders, founding Religions or claiming vacant City Sites near other players, not accepting Truce when about to capture a City
Ruthless AI now just gives opinion penalty towards the player when they are close to victory or in a strong alliance
Reduced frequency of 1-tile-wide inland mountain passes, most are now increased to a width of 2
Tight turn style now prevents all actions with military units when not your turn (instead of just preventing attack and movement)
Improved AI anchoring
Minor Unity update to 6000.3.15f1
Initial leader death immunity turns moved to mortality.xml
Fair yield now included in Send Luxury tooltip
Fixed worker recommendation icons not updating when switching to a worker in a different city
Fixed critical hits not occurring during routs with critical hit preview option
Fixed event helptext for TraitInvalid subjects
Fixed missing hurricane variants for Groves and related resources
Fixed play by cloud emails sometimes including incorrect information
Fixed Mods Not Found popup getting cleared by screen switch
Fixed goal counts in some cases in Rise of Carthage scenario 2
Fixed some event helptext is Heroes of the Aegean scenario 4
Fixed Gudit's Intimidate mission appearing when she is not the player's leader (Wonders and Dynasties)
Fixed Ranger leader not giving strength modifier in Jungle (Empires of the Indus)
Text and event fixes