Microsoft is going to give us an RC release in June before Windows 8’s planned October release.
The first week of June should see the release of Windows 8 Release Preview, as Microsoft prepares Windows 8 for a mid-Fall release some time, likely, near the end of October.
These plans were announced by Steven Sinofsky, the head of Microsoft’s Windows Development arm, at a developer’s event in Japan, according to All Things D. This release preview follows both Developer Preview late last year and a Consumer Preview in February of this year.

Apple is due to release its latest OS version OS X 10.8 Mountain Lion sometime this summer. Windows 8 is meant to directly compete with Apple’s planned OS release this year. How well it succeeds will depend on how well Metro is accepted on the desktop, as Windows tablets are not widely in circulation, if at all, as of this writing.
Soft32 is planning on reviewing the final version of Windows 8 when it is released, so stay tuned for our final thoughts and impressions on the OS later this year.