Microsoft has already confirmed that it would send Windows 8.1 to OEMs in August, but the company has remained completely tight-lipped on the actual launch date of the OS update.
Now MicrosoftPortal.net claims that Windows 8.1 could hit RTM as soon as August 16, with the final version to be labeled as build number 9500.10554.
Citing leaked information, the source says nothing about the official release date for end users, but previous reports have indicated that Microsoft is planning to announce general availability soon after 8.1 reaches RTM.
Windows 8.1 is already available for download for Windows 8 users as a free update from the Store, but Microsoft recommends consumers to wait for the final release unless they have the time to deal with some bugs.
Keep in mind that this is just a rumor, so take everything here with a pinch of salt until Microsoft rolls out an official announcement.