On January 27th a countdown will be added to the Windows 7 page to let visitors know that time is running out. Technet and MSDN subscribers don’t need to worry – you’ll continue to have download access through the remainder of the beta period.
Users with slow connections will be glad to know that there’s a two day period. As long as your download starts on the 10th, you’ll have until the 12th to finish it. Product keys will “continue to be available after February 12th,” though the announcement doesn’t say what the final date will be.
Since I believe that their gaining some positive responses from the beta users, extending its download to reach more users in time.