Note that while Blizzard is looking to get feedback about these tweaks, the developers have said that further balance changes aren't coming before launch since Diablo 4 has gone gold.
The highlights of these changes were buffs that gave Barbarian's damage resistance and Druid's improved skills, a nerf to the Necromancer's minions and the damage of the Corpse Explosion skill, and some reworks to several dungeons and boss fights that reduce the amount of time you have to spend backtracking and make certain bosses easier to fight with melee-focused classes. Secondly, the Server Slam patch will include the recently announced Diablo 4 beta feedback-driven balance changes coming to the game at launch. First off, the Server Slam's level cap will be 20 instead of 25, which means that you won't be able to level up quite as much as you could in previous betas. While the overall Server Slam beta experience will be almost identical to past beta tests, there are some notable differences that players should be aware of.