we should know by now with Microsoft one answer leaves new questions unanswered lol

yes win 8.1 core = windows 10 home not sure if insiders will all get pro or not

Will non-genuine Windows licenses qualify for the Windows 10 upgrade?

The simple answer is no. This is what Terry Mason had to say:

Microsoft and our OEM partners know that many consumers are...

Source: http://blogs.windows.com/bloggingwindows/2015/05/15/genuine-windows-and-windows-10/