From the blog "Sandbox Update Notes"
+ Added Dirt Cliffs, Grass, Snow, and Sand as inventory items
+ Added a new font that can be seen throughout the UI
+ Added Soccer Ball
* Shovel can now raise terrain
* Fixed an issue where mouse cursor detection over inventory slots would fail unless the player was standing at 0,0
* Improved item tooltip display
* Improved look and feel of buttons and panel UI elements
* Items can now be dropped on the ground
* Cloud shadows now display in the main menu background