According to a report published at W7 will be released this year, October 23rd.

"23rd October is the date the Windows 7 will be available. There is a 30 day upgrade time so that customers don’t wait to buy a new computer, so if you buy during that 30 day period, you’ll get a free upgrade to Windows 7", Bobby Watkins, Acer’s UK MD told Pocket-lint.

Microsoft has not confirmed or denied this information which seems to me right it you take in consideration the time between the release of the Beta and the RC.

Acer confirms Windows 7 available 23 October