Looks like the rumours over the weekend turned out to be true. Here's the announcements about Microsoft acquiring GitHub.
I personally feel that if any company is going to acquire GitHub, Microsoft is probably one of the best choices. Their company culture has certainly changed immensely in the last 5 or so years. Time will tell if this is for the best, but considering that GitHub has never really been profitable, they were going to be swallowed by someone big eventually... or would have had to shut down.