Boit titled his video about the patch "The Age of Norse-ology is over! The time of the Kuafu begins!" I'm mainly interested in ranked balance, so my summary ignores the single-play campaign and Gauntlet mode changes, but:

• All general-purpose infantry made weaker against pierce

Greece:

• Various myth unit buffs
• Hero buffs vs myth

Eggy:

• slingers made slightly more general-purpose
• spearmen slightly less general

Norse:

• Major eco nerf

Atty:

• Cheiroballista -1 base range, but +1 range for each line upgrade (so +2 range when fully upgraded)

China:

• fire archer range reduced
• unique heroes nerfed against human, but stable against myth
• kuafu 15->10 favour

Japan:

• Kamaitachi (the razor-weasels) +30 food, reduced special attack area, increase hack armour
• Jorogumo (the spider-ladies) buff armour & health
• Yumi archer frame delay reduced (I think that's what this says, essentially?)
• Dojo units give less bushido
• shrine gives more base favour, but less favour from food