As a follow-up for anyone who comes across this question, Tridion Sites is indeed an SDL, now RWS, offering. It integrates with the enterprise translation management systems from RWS including TMS, WorldServer, and Trados Enterprise.

There isn't a direct integration to Trados Studio, though CMS editors could send and re-upload source XML files as mentioned above.

 Paul explained the expected format from Tridion Sites is ITS. This is the preferred approach and the ITS files are generated when using the Translation Manager feature in Tridion Sites to send CMS items to one of the above mentioned translation management systems. After jobs are received from the CMS to the translation system, linguists could work on the ITS files at the appropriate steps in the workflow (such as .For more information on Translation Manager, see the RWS Documentation Center topic.

Note that a Tridion Sites customer would need to first set up Translation Manager and a corresponding workflow in the TMS in order to send and receive translation jobs from the CMS.