There are already several Office apps for iOS, from the OneDrive and OneNote apps to the simplistic Office for iOS (now renamed Office Mobile); Office for iPad is a different and more impressive beast. What you get are versions of Word, Excel and PowerPoint designed for iPad. They don't have anything like all the features of Office 2013 for Windows or Office 2011 for Mac, but they do have a great touch interface that makes the features you actually get, work well with just your fingers whether you're fixing a broken formula in Excel or adding pictures to your presentation in PowerPoint or tracking changes and reviewing comments in Word.