NeoWin claims a trusted source within Microsoft informed them that the first release candidate of Windows 7 is expected to arrive on April 10, 2009.
At this time, Windows 7 RC is internally being tested and the official release date is set for April 10, 2009. The Windows team is right on schedule with development, and if there are no significant problems over the next few weeks the April 10, 2009 release date will remain in tact.
Not much information is available at this time. We're uncertain if the release will be a world-wide, and Microsoft is expected to do more testing before releasing a RC build to the public. With that in mind, TechNet and MSDN subscribers should be the first to receive the RC build. A recent email conversation between Paul, over at GeekSmack, and Steven Sinofsky, Microsoft Senior Vice President of Windows, revealed that there have been over 500,000 suggestions since the public launch of the Windows 7 Beta.