Work on Windows 9 continues these days, as we’re getting insanely close to the public launch of the very first beta of what could be another major revamp of our beloved operating system.

It appears that Microsoft has recently completed development of another Windows 9 build, as version number 6.4.9830 has been spotted online, most likely as the company was test-driving its features.

No specifics are available at this point, but we already know that a public beta is expected to be released later this month for anyone willing to give it a try and help Microsoft improve the final product.

“Why are these builds numbers so important?” you might ask. The reason is as simple as it could be: with Microsoft fueling the secrecy surrounding Windows 9 on pretty much every single day when it refuses to disclose details about the upcoming operating system, there’s no doubt that people are trying to keep an eye on everything related to this project.

This new build is living proof that development of the new Windows 9 advances and a public beta is quickly coming, with people close to the matter indicating that Microsoft is preparing an event on September 30 to present plans for the new operating system.

Since Microsoft completes development of new Windows 9 builds on a regular basis and the company has already submitted new testing versions to partners, it’s only natural to expect leaks to reach the web in the coming days, but as far we can tell, such a thing is very unlikely to happen.

Microsoft has implemented new security measures to make sure that Windows 9 leaks are impossible, but in case partner builds indeed reach the web, it should be very easy for the company to determine the original owner.

Needless to say, Microsoft does not want any Windows 9 leaks to be released online before the public unveiling, and since Alex Kibkalo’s arrest, the amount of information on new Windows projects has been reduced dramatically. 

And still, we do know that Windows 9 will be released in stable form in April 2015, with Microsoft planning to introduce new features to the testing build using a new internal update mechanism that would not require fresh installations.

The feature lineup is expected to include options such as a Start menu, a desktop version of Cortana, options to run Metro apps on the desktop, Internet Explorer 12, a revised Modern UI, and many other improvements.

More information will be disclosed later this month by Microsoft itself, while download links for the public beta should be disclosed either in late September or in early October.