So, an update for the SDK of Windows Phone 8.1, that caused the serieus feature leak, has been send out. And guess what? It makes references to Windows Phone 8.5. Yes, you're reading right, Windows Phone 8.5 might be the next big update for Windows Phone.
This might be Windows Phone Threshold, which could mean that the next Windows version - also Windows Threshold - might not be Windows 9 like so many are expecting.