Here's the change log as well:
Engine:
*Rewrote the engine.
*Significantly simplified gameflow logic.
*Added support for data hotloading.
*Wrote a shiny new property editor.
*Removed a ton of old legacy code.
*Rewrote the effect system, note that certain effects are missing as of now.
*Added a launcher option to set grass rendering distance.
Multiplayer:
*Implemented LAN multiplayer for both race and derby, currently supports 12 players.
Input System:
*Added remapping support for XInput devices such as the X360 gamepad.
*Added D-pad and look-around support for DirectInput devices.
*Increased the amount of rebindable controls.
*Added analogue handbrake support.
*Added proper H-shifter support.
Gameplay:
*Improved AI behavior to help it stay on track better.
*Added support and first draft scoring events.
Damage:
*Implemented new damage system based on tracking deform instead of impacts.
*Improved deformation to make the cars break apart in a more realistic manner.
*The car that is heavier and traveling faster will now have an advantage in collision.
*Fixed an issue where unlocked panels such as doors would not animate correctly.
*Added a placeholder smoke effect for the critically damaged engine state.
*Added a release state to all wheels so that they can be torn off.
Cameras:
*Implemented an improved camera system.
*Reworked all cameras, FOV, position, etc.
User Interface:
*Rewrote the user interface platform.
*Implemented new Replay user interface.
*Added a preliminary scoreboard to post-race.
*Improved the main Garage UI somewhat to enhance usability.
*Removed the vignette effect when getting damaged during gameplay.
*Added support for fetching Steam user name and avatar.
Vehicles and Upgrades:
*Added a new American Muscle car.
*Reworked engine upgrade parts to mimic real-life parts.
*Reworked the suspension setups for more authenticity.
*Added first upgrade part descriptions.
*Improved gamepad controller functionality.
*Switched Anti-Spin assist to an improved Stability Control assist.
Vehicle Dynamics:
*Added simulation of Ackermann steering geometry.
*Improved shifting center of mass calculation when vehicle is airborne.
*Improved simulation of viscous forces when driving on loose surfaces such as gravel.
*Added engine shake calculated from the piston movement to simulate engine rumble.
*Added support for turbochargers and superchargers, upgrade parts using this feature coming later.
*Improved suspension simulation; center of mass now affects suspension.
*Improved suspension geometry simulation.
Weathers:
*Improved weathers to give a better sense of light.
Tracks:
*Added a new Sandpit race track, still work-in-progress!
*Enhanced various bits and pieces of the existing tracks.