Mmmh. I use MS Office at work because I have to, but I really don't like it. Office 2013 has given me more headaches than 2003, 2007 and 2010 combined. So personally, I hope they don't.

Of course, if MS Office was available on Linux, converting regular users would be so much easier... But for the time being, I don't see it happening. It would probably be a lot of work, and the demand probably is not there. Last time I saw any numbers, desktop machines in western Europe ran about 90% Windows, 7-8% OS X, and ~1.5% Linux. So unless porting Office to Linux happens to be trivial (which I doubt), it is not worth the effort at this time. (OTOH, they did port it to iOS and Android, so it cannot be impossible, either.)