Hello sbjari,
We add new languages periodically to the Microsoft Translator service, and make the announcements through our blog at
http://blogs.msdn.com/b/translation.
The most important learning material is existing high quality translations, the same text in two languages. Over 1 million words of this type of text is required to build a reasonable quality machine translation system for a particular language pair.
Users who may have access to this type of data, or to a community committed to adding a new language, we offer free use of the
Microsoft Translator Hub. Several languages, including Hmong and Welsh, have been added to the Microsoft Translator service via the Hub.
Thank you.
Microsoft Translator team - www.microsoft.com/Translator