Windows 8’s successor, codenamed “Windows Threshold”, will most likely be unveiled at a press event currently scheduled for September 30th. The Verge reports that Microsoft is planning to hold a press conference where they will detail the new features in the upcoming OS, including the return of the Start menu and windowed apps, the removal of the Charms bar and Cortana. They might also reveal their plans for the combined Windows Phone/Windows RT version they’re building. While no official event invites have been distributed yet, sources close to the matter tell The Verge that Microsoft will probably hold the event on September 30th. Earlier ZDNet reported that Microsoft was planning to release a beta version of Threshold in September. This “Technology Preview” would include mandatory monthly updates and would be available to anyone who is interested in taking it for a test drive. Chances are that the Technology preview will be released at or shortly after this event.