The upgrade option varies by PC manufacturer to retailer, and is redeemable till end February 2010.
Windows 7 will be available come October 22 in 14 languages--English, Spanish, Japanese, German, French, Italian, Dutch, Russian, Polish, Brazilian Portuguese, Korean, Simplified Chinese, Traditional Chinese & Traditional Chinese (HK). Versions of Windows 7 in all other languages will hit shelves on October 31.