Looks like there is some good content to this patch.
I'm most excited for the:
Nested tooltips. These are essential for understanding the mechanics and lore of BG3.
Dice rolling updates. It looks like bonuses are now ADDED to die rolls instead of lowering the DC. Also, being able to use spells during dialogue is great.
Splitting jump & disengage, and making disengage a full action. This will make combat so much more tactical and less Super Mario.
Maybe non-lethal attack toggle. The fact that the previous "knock unconscious" left combatants hostile when you encountered them again made using it worse than useless, because the enemy would often then cause all nearby NPCs to often turn hostile. It's unclear if Larian has changed this with Patch 5, but it's possible. This is something I'll definitely check.
All the camp changes: scenery and restrictions. Especially since the item "Camping supplies" has been added, which is enough food for a single rest. So you can just buy X of those from merchants instead of having to collect miscellaneous food items. There's also an "auto select" button which is a good QoL feature.
Importantly, many of these changes have been asked for by a sizable portion of the community. This patch really marks the first one that been mostly dedicated to making changes that align with community feedback. I am happy we got this patch instead of a patch that simply adds new content (classes, races, story) to EA but changes little. Keep it up Larian!