Preview at WWDC likely in June, followed by September launch.
iTunes Match Launching in New Countries Including Austria, Greece, and Italy
iTunes Match signup page in Italian iTunes Store
It remains unclear just how broad this latest round of debuts is, as Apple has yet to update its support document outlining availability of iTunes in the Cloud and iTunes Match, but signs of activity in various international iTunes Stores suggest that iTunes Match may also be going live in Bulgaria, Portugal, and Slovenia.
As part of the new rollout of Apple's paid iTunes Match service, users in these countries should also be receiving access to the free iTunes in the Cloud services for music and music video, which allow users to re-download purchased content any number of times to devices associated with their iTunes Store accounts.