For Microsoft, Wednesday, Jan. 21, will be a major event, as the Redmond-headquartered tech titan will be releasing the first preview of the Windows 10 operating system's mobile version via live stream.

However, the first public release of the Windows 10 mobile SKU, which is expected to be common for Windows Phones as well as the smaller tablets based on Intel and ARM processors, will only take place some time next month.

The keynote part of the event will be streamed live by Microsoft is at noon ET/9 am PT. Check out the official live stream link here.

According to ZDNet, while the first Windows 10 event was held in September 2014, wherein Microsoft presented an overview of its strategy as well as technical preview plans regarding its latest mobile operating system, during the upcoming "Windows 10: The Next Chapter" event, scheduled to be held in Redmond on Jan. 21, Microsoft will actually showcase the Windows 10 mobile operating system.

Mary Jo Foley writes in ZDNet that her sources claimed that the tech titan will also demonstrate some of the work done by the company around its touch-first/ Windows Store version of Office and perhaps also the progress made by the company on its "Project B." The latter is actually a purported Windows gaming "helmet" that is currently being developed by Microsoft's devices division.

Quoting sources, the report states that the major upshot that Microsoft is hoping to deliver now is the fact that Windows 10 has been built on a single, common "core," which has been internally dubbed as "OneCore." This will work across an assortment of devices, including phones, tablets, PCs as well as large-screen displays such as Microsoft's Perceptive Pixel multitouch-screen devices, and also the Xbox.

According to the report, OneCore not only entails just the common core, in fact, OneCore also comprises the dynamic link libraries (DLLs), application platform layer and other pieces of the operating system.

Therefore, Microsoft is possibly going tell the developers that with Windows 10, they can design similar core environment using their apps, and that these "Universal" apps will work on a variety of screen sizes. Moreover, all these apps can be availed from one store, instead of the separate Windows, Windows Phone, and Xbox stores.