Microsoft’s Windows 10 event, scheduled for Wednesday, actually could focus more on hardware than on the operating system, given that the next Windows 10 refresh is expected in March. A new Surface device — possibly an all-in-one computer with a 21-inch or larger screen — could be in the offing. Whether Microsoft will unveil updates to its Surface Pro 4 and Surface Book devices or showcase products from its OEMs has generated some debate. “It’ll be a hardware event,” predicted Rob Enderle, principal analyst at the Enderle Group.