New features, (almost) all about improved game creation! W00t!
Multi-stamp: Select multiple pieces in the Workshop and stamp them as a group. Enables you to create complex structures, bosses, etc. and duplicate them easily.
Screenshot preview: Preview what your game screenshot will look like before you publish your game. Don't like it? It's easy to change!
Easy rotate: Rotate pieces easily. The rotate control appears as soon as the piece is selected.
Add player pieces to your bag: You can now drag any piece to your bag, player pieces included.
Improved navigation: Get from one place to the next more easily and faster, without having to expand the navigation.
Awesome, right? So go make a game now!