Brief summary: (credit to Loriri (Idi0ticGenius) for translating)
Dungeon
Velik's Temple Hard Mode added:
Top Tier Dungeon
Item Level 429
5-man Party
Rewards: Tier 2 Accessories, VM9 Materials, Dyad Niveot Structure, Tier 12 Enchantment Material, Premium/Extensive Alkahest, Goddess Tears, etc
Dungeon Balance Changes
Nerfs for Velik's Temple Normal Mode, Velika Undergrounds Hard Mode, Bathysmal Rise Normal Mode, Kalivan's Dreadnaught Normal Mode, Demokron Factory Hard Mode and Timescape Normal Mode.
Battlegrounds
Decreased item prices listed on Bellicarium and Killing Spree Merchant by 20% except for crystals.(crystal prices remain the same)
Gears/Item Changes
Slightly increased base attack modifiers of Ambush and Behemoth weapons by roughly 3.5%
Goldfinger Tokens now can be stored in bank.
System and UI
Vanguard Menu have been adjusted to recommend missions suitable for the character's Item Level.
Achievement Categorization and Tiers have been adjusted
The current season’s great achievement “How many times has this been…” have been lowered by 1 tier.
The current season’s category “Southern Arun Dungeon” have been changed to “Great Achievement”