Someone has been predicting that Microsoft would in the future produce their own Linux Distro on Slashdot for the last 5 years. I remember thinking it sounded impossible for for the first few years. Seems prophetic now.
This may seem good, but my paranoid half (make it 9/10) thinks they could "hijack" the Linux user base by releasing software certified as Linux compatible that runs only under their Linux, and by being platinum members of the Linux Foundation they could be entitled to say that their Linux is the only true one.