Today Microsoft released much waited Microsoft Office 2013. Office 2013 is optimized for touchsceens & traditional desktops and its definitly targeted to Windows 8.
Now you can download & test Microsoft Office 2013 Customer preview from below URL
You can install 64 bit & 32 bit version of MIcrosoft Office 2013 online.. INstallation is little bit slow but its worth to test Office 2013. For me specially Microsoft Lync client 2013 which is incorporated with Office 2013 setup..