Two new arenas with new mechanics
New weapon
New menu visuals
New special cards such as a nuclear bomb, size increase, water stop, and more
Fixed disconnection issues
Helpful hints in the battle search menu
Improved interface and card selection, especially noticeable on PC
Improved sorting
Bots are a bit smarter now
Another visual improvement in the roulette
Many small improvements such as enhanced anti-cheat protection, new mediation from other publishers, daily reward highlighting in the correct shop tab, some texts translated, and more
Bug fixes and new ones added :)
Source: Steam Community (opens in a new tab)