• Automatically repair when visiting a vendor that can repair [this can be toggled on/off]
• Automatically vendor grey items/junk [this can be toggled on/off]
• Added cast times to castbar, removed border around castbar, and made it slightly bigger
• Added additional (smaller) personal health and power bars to the middle of the screen, Legion/BFA-style [this can be toggled on/off]
• Class colored health bars [this can be toggled on/off]
• Class icons (new, flat versions) in portraits [this can be toggled on/off]
• Made URLs in chat clickable
• Added more chat font sizes
• Darkened default UI textures slightly
• Increased the size of most unit frames and other 'critical' UI elements, so that they remain decently sized on smaller UI scales
• Moved the default player/target unit frames slightly towards the center horizontally. An additional option to move them to the bottom-center exists
• Added a visual indicator when player enters or leaves combat
• Added enemy health percentages and mana numbers to their unit frames
• Automatically accept and complete quest dialogs

Check the master branch.