I think what you are trying to say is that Office 2013 is only available for PC, the latest version of Office for Mac is 2011. If you buy the subscription edition of office (Office 365), you can download Office 2013 on PC but still only Office 2011 for Mac.
The question is: are we getting Office 2014 for Mac, just like 2011 followed 2010? The new features with 2013 is mainly the new "Metroesque" UI and the possibility to stream the applications instead of doing a traditional install. Don't think Microsoft have any interest in bringing that to OS X...
My wife upgraded from 2008 Office to 2011 Office and has had nothing but problems with it to the point I removed it from her OS X system with extreme prejudice.
From a professional writer's perspective it no longer has features or abilities the old Windows version of Word For Windows 2 had and some of the current features of 2011 are so buggy as to be unusable.
I'm hoping that 2011 will be my last purchase of Office. So many text editors out there. Pages can do the import and conversion if I really get stuck and Office 2013 will be so overpriced to drive us on to the online edition (with its $99 per year subscription). I just hope one day that businesses manage to get rid of it.
I got tricked into that too. But I called Microsoft and got a refund within 20 minutes of my purchase since I already owned Office 2011. Microsoft wants us to salivate over Office 2013 in hopes of us buying Windows 8 for bootcamp (which i did for other reasons). I anticipate an update to iWork before 2020.