Non-Content

EDIT: marked this as alpha release, going to update soon to address a few issues

1.2.0

New Mods:
Pet Bats - tame regular bats using pumpkin pie so they follow you around as a pet
Ender Flowergirls - Blocks endermen from picking up blocks, restricts them to only flowers
Attachable grinder - extract more stuff from animals at a cost
Spartan shields - Better shields
JER - to see mob drops and dungeon loot in JEI
Psi - Powerful tools and items with a programming theme
Visible armor slots - see armor slots in may GUI screens.
Ambience - for adding music packs
MineTunes - for making your own playlists with your own music in game
FlowerCreepers - some creepers create flowers instead of explosions
DuckCraft - just ducks
Baby Animal Model Swapper - a purely visual mod
VeinMiner - big timesaver for mining/harvesting, hold an extra keybind to mine multiple blocks

Mod Updates:
lots of mods had bugfix updates
new content from Cyclic
new features from Quark

Significant config changes:
DualHotbar mod is now disabled by default, but can be turned back on. (not everyone likes it, can be confusing)