Last night, the CM team released the preview of CM10 for the U.S variants of the Galaxy S III, with no love shown towards the international variant of the device. Earlier today though, a member of Team Hacksung, XpLoDWilD, released a preview build of CM10 for the international variant of the Galaxy S3 a.k.a I9300.
Since this is a preview build it lacks majority of the CM features that will be added later on, once all the bugs and issues have been fixed. In the preview build, the FM Radio is broken, while Wi-Fi tethering and Camera partially work.
Interested Galaxy S3 (I9300) owners can head over to this thread on XDA forums for more information, download link and the installation steps.