Their source claims to have seen Office running on an iPad. There were some reports last December saying that Microsoft was working on Office for tablets that use the ARM processor. But Microsoft then denied that they were working on it last Januray.
See the full story at: http://www.bgr.com/2012/05/23/microsoft-office-ipad-android-launch/
Of course there are a number of current alternatives, including Apple’s own iWork programs Pages, Number and Keynote. Third party apps include: Smart Office, Office2 plus, Quick Office and Documents to Go. All for $19.99 or less.