All bosses will have their own Treasure Bags (I'm assuming).
Dice.
The Drill Mount can fly.
Fossil Ore.
Golden Dye on pets.
(Probably) Decrease spawn rate buff, I can't figure out the second one. Possibly an upgraded Ironskin Potion.
Ironskin 2.0.
Item Frames, new chests(?) and epic statue of the head of the final boss.
Martian missile launchers.
Meteorite Blocks & Furniture.
New cannon type.
New banners.
New torch.
Painted Living Fire Blocks finally emit light the color they're painted.
Pillar Shield warps the blocks around it (possible bug).
You can actually damage the Pillars.
Player throwing Gas Bombs.
A better look at the statue on top of the Marble house in the beginning of the video. Another statue of the head of the final boss.
Epic flame vanity.
Original Tombstone gets a revamp.