There were rumors that Microsoft will soon release a consumer preview build of its upcoming Office pack and it seems that time has come. Office 15 is expected to hit market by early 2013.
Microsoft needs to work hard on this version of Office as they are getting very tough competition from free suites specially from Google Docs which has slashed the sale of MS Office.
Microsoft will redesign Office 15 as per the Tile design of Windows 8 which seems to major release of Microsoft this year. They also make changes in UI as per the needs of tablets like their own Surface.
Microsoft also working on bringing PDF editor to its Word application. Microsoft is not making any separate version for Windows RT devices, which will run on ARM based chipset.