Microsoft already has marked 22nd October 2009 as General Availability(GA) of Windows 7. Microsoft is going to release Windows 7 in 36 languages across the world.

According to Microsoft, the English, Spanish, Japanese, German, French, Italian, Dutch, Russian, Polish, Brazilian Portuguese, Korean, Simplified Chinese, Traditional Chinese and Chinese (Hong Kong) languages of Windows 7 will all be offered to consumers in their respective markets on October 22.

E7 Blog says:
The end result of the work to improve globalization and localization quality is reflected in the announcement that all fully localized releases of Windows 7 will be available within two weeks of the initial release wave with all languages available in October. We hope (and believe!) end users will find the overall quality of these releases to be the best ever.

In addition to the 36 languages that will be released in October, there will be additional languages available for download as Language Interface Packs (LIPs) onto any Windows 7 edition as part of the Local Language Program (LLP). The LLP is a partnership with governments, universities, and language experts from around the world. (You can find more information on the LLP at http://www.microsoft.com/unlimitedpotential/programs/llp.mspx.) Work on a LIP starts at RTM and continues for many months based on the schedules of our partners. Two (2) LIPs will be available for download when Windows 7 is available in October – Catalan and Hindi. Additional LIPs will become available for download over the following months based on the schedules of our partners. We are happy to have improved the delivery time of the first 38 languages (36 + 2 LIPs) and recognize that future releases are an opportunity to improve further. Creating a track record of dependable release schedules on our part will help everyone around the world plan better for a more unified release timeline.

Source: E7 Blog