Assetto Corsa 1.3 will have graphics updates too:
Graphics
2D/3D models, textures and shaders have been updated and improved, in order to keep the standards reached with the latest content. Now windscreens receive shadows, and a new camera facing feature improves the rendering of 2D/3D objects on track. A first basic support for dynamic objects on tracks has been added as well, and it will be improved in future updates, with the aim to get a more immersive environment.
Physics
64-bit natively supported and car physics calculated on multi-thread. The physics engine has been reworked to become completely multithreaded: as a result, the driving precision is augmented, the accuracy further improved and the physics solver has enough horsepower to completely resolve any difficult calculations any speed, achieving butter smooth Force Feedback and complete elimination of signal noise and vibrations. We'll be back with more details on physics updates when the new build will be released next week.