Blocks:

• Replaced redstone with a more simplified version
• Redstone strength indicator (white numbers on redstone)
• Playing jukebox texture
• Hopper, dispenser and dropper direction indicator
• Added indicators to all observer sides (little pieces of "redstone")
• Sticky piston texture (slime on the head)
• Target block hit marker
• Note block instrument and note indicator (if anyone has better textures feel free to let me know)
• Kelp, weeping, twisting and cave vines max age indicator
• Weighted pressure plates power level indicator (redstone line on the side)
• Cauldron level indicator
• Composter level indicator
• Bee nest honey indicator
• Beehive honey indicator
• Lectern power indicator
• TNT stability indicator
• Scaffolding corner indicator (different texture when the next scaffolding would fall)
• Removed stonecutter animation
• Different textures for melon and pumpkin stems
• Final bamboo stage indicator
• Decaying leaves indicator
  
• Sapling growth stages
• Respawn anchor top indicator

UI:

• Changed the options background
• Potion brewing guide in brewing stand GUI
• Made equipped pumpkin texture less opaque
• Changed the attack indicator
• Changed the health texture to be more visible while withered
• Removed health flash (white hurt indicator on the hearts)
• Removed health loss indicator (how much hp was lost in a damage instance)
  
• Number of metal blocks required for a beacon in beacon GUI
• Use guide in cartography table
• Fuel guide in furnace
• Removed vignette

Items:

• Different Banner Patterns
• WIP spawn eggs
  

Planned features:

• Custom texture for every spawn egg (until then use www.planetminecraft.com/texture_pack/unique-spawn-eggs-1-13/ by ZodaInk)
• Door state indicator
• Daylight detector power level
• Make Note block textures not ugly
  
• Minor trapped chest indicator
• Show repeater delay (suggested by Matej004)
  

• Vanilla Tweaks (xisumavoid.com/vanillatweaks)
• Redstone++(www.planetminecraft.com/texture_pack/redstone-4093346/)