A lot of new functionality going in before launch to help balance the difficulty.
Jupiter's Moons - IO, Ganymede, Europa, Callisto are being added to the Jupiter levels to help with the easy level training ground.
Mars's moon: Phobos - is being added to the Mars levels, this will rain down powerups when destroyed.
The Belt is being added to the Earth levels, a ship-shredding belt that orbits the Earth. Destroy the Belt to start a rockstom sequence of enormous destruction.