Microsoft will take the stage during its "Windows 10: The Next Chapter" press event in Redmond tomorrow, where it will reportedly dive deeper into Windows 10 and discuss how the operating system will work across mobile devices, including smartphones and tablets, for the first time. Earlier reports suggested Microsoft might also immediately launch a new preview version of Windows 10 for phones, but that may not be the case.

ZDNet's Mary Jo Foley, a journalist well known for reporting on Microsoft news, said Tuesday that Microsoft will instead release a public test version of its Windows 10 for phones operating system sometime in February. The software will reportedly run on both tablets and smartphones, which is a change from Windows 8, which had different SKUs for tablets, smartphones and computers.

That strategy is going to be just a part of Microsoft's "OneCore" initiative, Foley said, which is Microsoft's goal to create a unified platform across devices, but with different Windows SKUs when necessary.

Foley said Microsoft plans to show off the new features included in the mobile release tomorrow, in addition to touching on other projects including a touch-enabled version of its Office suite and its gaming helmet currently codenamed Project B. The event kicks off at 9:00 a.m. Pacific, and we'll be covering the news here as it breaks.