Well according to their blog it will be possible and will be supported. http://blog.linuxmint.com/?p=3051 How reliable this will be is another question.
Well if W10 is the last OS M$ is going to make. Which M$ has said many times. Then there's not a lot ways they can go to keep the OS revenue going.
Sorry for the question - only because in the past I liked Mint, so I could be interested now - but what about download security ?