Improved networking code that can deal with your connection failing and automatically reconnects.
Planes now lead their shots and are much better at intercepting each other and hitting smaller fast-moving ships.
Biplanes have a significantly higher rate of climb and descent so they can catch up to torpedo bombers.
You can now (finally) tell the game to auto-select your preferred screen resolution.
Rewrote text input code to be smoother. Also now offers some support for writing Chinese/Japanese input methods in Windows, though at the moment you need to play in windowed mode to see the input window.