LogFAQs > #970358984

Glancing through a summary of the Live Letter, two main things jumped out at me.

https://www.pcgamesn.com/final-fantasy-xiv-a-realm-reborn/ffxiv-6-3-release-date-live-letter-75

Paladin changes (partial list):

Rotations have been shortened to accommodate high-powered actions.
Damage over time effect for Goring Blade and Blade of Valor has been removed and their potency has been adjusted.
Divine Might is now applied after weaponskill combos, allowing an enhanced Holy Spirit to be executed once without casting.
Holy Sheltrons effect has been changed to reduce damage taken, thereby enhancing defensive capabilities against damage over time.
The previously removed Bulwark ability has been revamped and reintroduced, offering increased defensive capability.
The utility of several other actions and combos have also been adjusted.

Retainer buff:

Retainers get a very handy new stack system that allows you to quickly transfer all items from your inventory that can stack onto matching items held by your retainer. Yoshida notes that you can untick certain items before making the transfer, allowing you to hold onto anything you wish and quickly deposit all the remaining items. He jokes, it only took us ten years to add this feature.