Today you can download the new version 2.4!!. You have 3 new fonts (optimized for horizontal space, narrow letters), and new undo/redo functionality on certain tools.
Move, scale, rotate and light tools have Undo/Redo when you use finger gesture to move the objects. The functionality is restricted to only one object (if you choose another object, you loose the history). This new functionality helps you when you are working with and object and make some mistake, now you can go back (or redo).