Here is the weekly Blizzard post and datamined changes for the Paladin Talent Trees on the Dragonflight Alpha.
Retribution Paladin Talent Tree
From today’s Alpha update notes:
Divine Protection has been added as a choice node with Shield of Vengeance. Cooldown increased to 2 minutes.
Justicar’s Vengeance now costs 3 Holy Power and deals 7% less damage.
The talent locations of Ashes to Ashes and Divine Toll have been swapped.