Both of these features are expected to ship in the final version of Windows Threshold, expected to be named Windows 9, but they will not be included in the Technology Preview that's due to be distributed late next month. Sources familiar with Microsoft's plans tell The Verge that the company will be updating the Technology Preview once or twice a month to add new features for testers, and the notification center and interactive Live Tiles will come later in testing.
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An example of interactive Live Tiles from earlier this year
Microsoft is currently aiming to hold a press event to introduce Windows 9 on September 30th. This date may change, but a Technology Preview of the operating system will be distributed to developers and enterprise users in late September or early October. The early Technology Preview will provide a first look at the new mini Start Menu, the removal of the Charms bar feature, and several UI changes to the way the desktop operates with Windows 8-style applications. Future versions are expected to include a version of Cortana, alongside other new features that Microsoft is working to complete ready for release in spring next year.