https://www.wowhead.com/news/the-war-within-beta-development-notes-july-2nd-many-more-class-changes-344113

PALADIN
Retribution Aura has been removed.
Developer’s note: As part of our process of examining raid buffs, we’ve come to the decision to remove Retribution Aura in order to reduce restrictions on group compositions. We believe that the utility options additional Paladins are able to bring is sufficiently valuable without becoming oppressive.
Auras of Swift Vengeance talent node replaced with Crusader