This patch isn't too big and hopefully shouldn't affect any save files too dramatically. One interesting thing is that the way AoEs are handled has been changed to improve performance by a great deal, especially when it comes to keystones like Critical Blasts. If this or any other patch gives you issues, be sure to report them in the discussions or the discord server!
Improved performance by a good amount from excessive AoEs.
Amplified Spells skill now effects spells duration and affected area.
Heroes keep ultimate charge between Adventure maps.
Slightly increased difficulty scaling.
Slightly decreased enemy health scaling at high waves.
Adjusted Adventure mode costs and final battle balance.
Reduced hero price scaling in Adventure mode.
Duelist now targets enemies correctly, he doesn't get so focused on already dead ones.
Party members become a little smaller and a little transparent when moving a hero around.
Fixed Heroic Regeneration keystone also applying to enemies.
Fixed being able to bypass keystones.
Potentially fixed enemies getting glitchy and stuck/not spawning in correctly.