New game mode: Solo Battle Royale called "Expedition" with custom rules
UI redesign
New mechanics for the Expedition game mode
New sound effects (footsteps, when changing skins, etc.)
Some new items, item slot, new enemy
Mini Guide to Game Modes
Combat rebalancing
Minor changes to almost everything
HUGE UPDATE: Project Dungeons 2.0 Changes
Source: Steam Community (opens in a new tab)