As noted by 9to5Mac, Apple has turned on its iTunes Match service in Hungary and Poland today. Notably, the additions appear to make the Scandinavian countries of Denmark, Finland, Norway and Sweden the only ones of the over 60 countries in which Apple offers music through the iTunes Store to not have access to iTunes Match.
iTunes Match is Apple's subscription service that allows users to access their entire music libraries from a variety of Internet-connected devices via the cloud. Users' music libraries are matched to the iTunes Music Store catalog to quickly make many tracks available for download, with unmatched tracks being uploaded to Apple's servers. iTunes Match is priced at €24.99 annually in Hungary and Poland, the same as in other Euro countries.