Feats and titles. Fifteen feats are earned from your recorded runs and races: Survivor, Veteran, Mythic, Keystone Master, Keystone Conqueror, Untouchable, Swift, Warband, Lone Wolf, Boss Hunter, Slayer, Wayfarer, Champion, Racer and Pole Position. Each one is a title you can wear from the hero card; the Armory's Progress tab shows what you hold and how to earn the rest. Runs you already played count, so titles you earned before tonight are waiting for you.
Mirage Kart varies. The party leader picks the race length (Sprint, Grand Prix or Endurance) and the course (Forward, Reverse or Random), and every race rolls a twist: the Lich King comes early, item frenzy, rocket start, double boost or a pure race with no items. A rematch rolls a new twist. The banner names the course and the twist, and the announcers call it at GO.
Race leaderboards. Every finished race by a signed-in hero goes on the track's board (best race time and best lap, per course and length). The results screen shows the track record and your best with your rank; the Hall of Champions has the full Mirage Raceway tables.
Starter sets rebalanced. Starter (Tier 0) set bonuses are halved: 2 pieces +0.067 armor, 4 pieces +1% health, 6 pieces +1% damage, 8 pieces +5% to your two signature spells. Starter pieces drop 12% per eligible boss (was 20%), guaranteed after 6 misses in a row (was 4), so a full set is a longer climb and world gear matters sooner.
Car rooms get a Garage button under the minimap: pick your car there, and the party leader can restart the race from it. Developer tools are admin-only. On 1366x768 laptops the hero card no longer scrolls. The "Explore the game" link opens the public guide, which has a new "Co-op in three steps" page.