I noticed some cool features in their unveil - such as polygonal sprites rather than rectangles. This means it's cheaper to fill each texture to the screen, and

I noticed some cool features in their unveil - such as polygonal sprites rather than rectangles. This means it's cheaper to fill each texture to the screen, and it means the sprite atlases can be packed tighter resulting in less draw calls. They also changed the 2D UI so that you cannot select a sprite where it's alpha is 0 under the cursor, which makes it way easier to move and manipulate in the editor. Finally, they added an animation framework for the sprites which is powerful.