Acer UK seem to have confirmed that the release date of Windows 7 is 23rd October 2009... Which is much earlier than some reports from Microsoft have suggested in the past.
You can read more on this here.Although some rumours have put the OS' release closer to the end of 2009, Microsoft has yet to officially confirm that the software will be launched sooner than the 3-years-after-Vista timescale.
Acer also confirmed to us that any Vista-based models purchased in the 30 days prior to this date will be eligible for Microsoft's free upgrade programme.
"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.