The date of the RTM build for Windows 8 has just been outed by Wzor, who has been known to leak Windows information in the past. The claim states that the Windows 8 RTM build will be 8500.0.120623-1707.
The source claims that Microsoft will announce the RT between the 17th and 20th of July. The source specifically states that it is coming at the MGX event.
This information lines up to previously released information that says Microsoft will finish the Windows 8 RTM build in July; it would appear that Windows 8 RTM is literally right around the corner.
We have a lot more to find out in the later weeks, but Windows 8 is sure to be an operating system to look forward to.