Yeah 4.7b is a lot... but there are some really crazy valuations out there now. My hunch is they're going to go after the user base of enterprise users and either move them to Vis.Studio team OR (and this would be best) move VSTS to GitHub
I could hope. Microsoft has put some money behind other open source projects. I know they were working with Ubuntu and I think (must google & verify) they bought or put a lot of money into a distro (like ubuntu) a few years back.