There are new reports today that an unreleased build of Windows 10 has been leaked onto the Internet. The build number is 10102, and it apparently has the new features that were revealed in a previous article, including better Cortana integration and new transparency effects.
However, we will point out that this is likely an older build of Windows 10, at least as far as Microsoft's team is concerned. The development team has been working to release new, and official builds, of the OS to Windows Insider members at a faster rate, at least on the Fast ring. Therefore, we highly recommend that if you happen to find this leaked build somewhere on the Internet that you don't download and install it. Your best bet for getting a stable build is just to wait until Microsoft launches a new version, which could happen any day now.