Harder Trials: if you enter above a Trial's level, it now matches your hero's level. Trial monsters and bosses are stronger and Honour drops faster.
Tougher melee heroes: Strength now gives +0.2% Armour per point. The Barbarian gets +15% life and 6% less physical damage taken; the Vampire gets +12% life and 5% less damage taken.
Weaker reflect from Thorned monsters: they return less damage, and ranged attacks (arrows, wands) barely come back anymore. New affix: reduced reflected damage taken.
Hall chat in game: talk with everyone in the Multiplayer Hall while you play, solo or in a party, on the chat's Hall tab. You can turn it off in Settings > Interface.
Co-op: Inspect and Hideout invites work between guests again. The party panel shows the right character after switching characters.
Tessa's bench: new minion damage and minion life infusions.
The skill bar picker (K key) is easier to read, and currency text in the bench no longer spills out of its card.
The grey wolf no longer shows a cut-off face in its animations.