Patches are out for both PC and PS4. The XBox patch is still getting checked out by Microsoft and will probably be up soon. You can check it out here on the SMS forum including the very abbreviated fix list. http://forum.projectcarsgame.com/forumdisplay.php?119-News-amp-Announcements
The patch notes for PS4 and PC are identical so I assume that it'll be the same for XBox.
Project CARS 2 - PC Patch 2.0• Improved driving line assist.• Various AI behavioural and race line improvements. • Multiple improvements and enhancements to multiplayer, and lobby handling.• Improvements and enhancements to audio and sound effects.• Improvements and enhancements to replays and replay cameras.• USB keyboard support improved.• Improvements, enhancements and fixes to Career flow.• Enhancements to various cars’ handling and standard setup improvements.• Tweaks and fixes to Achievement / Trophy unlock logic.• Tweaks and fixes to setup UI and flow.• Improved default assists for gamepad users.• Fixes and improvements to headlights and brake lights.• Fixes and improvements to ICM appearance and functionality.• Improvements and enhancements to steering wheel support.• Fixes and improvements to certain weather / tyre combinations.• Optimisations to tracks across the game.• Myriad render and performance tweaks and improvements.