Just skimming the patch notes for a checklist of everything from 6.2 to now...
- Second part of Tataru's Grand Endeavor
- Tales of Newfound Adventure quests
- Somehow Further Hildibrand quests and Manderville weapons
- Island Sanctuary
- Pandaemonium: Abyssos raids
- Variant/Criterion Dungeons (Sil'dihn Subterrane)
- Omicron tribal quests
- Revamped Adventurer Plates and Portraits system
- New Triple Triad cards
- New quick chat actions for Crystalline Conflict
- Centered recast timers have been added as a setting in Character Configuration
- Customization for the currency HUD element
- Dynamic resolution setting
I think those are all the notable things. Not sure what you value, so I made sure to cover everything that might pique your interest or may be good to know.