I have heard lots of rumors but they are all unsubstantiated. When you look into them they are more wishful thinking than anything else. Of course it would be nice to have something like a Surface Phone but until there is a more substantial rumor it isn't worth getting to worked up over. The same thing has been happening with iPhone for years and still is wit the latest rumors of a budget iPhone for China.
It is nice to think about these things and follow the rumors but just keep in mind that they are only rumors... that is until they aren't