PhysX System Software 9.09.30, available only for PhysX developers previously, leaks out. As anyone else, were were not authorised to provide public download, but as concerned gamers gained access to Developer Support center, download link emerges.
Main difference in this release from 9.09.14 Drivers is updated .dlls for 2.8.3 PhysX SDK.
You can grab 9.09.30 PhysX Drivers here, while download is still available.
Update: Mirror #2;