I cannot picture Word on iPad. It would be nice but Word is already so slow at just scrolling through large documents on Mac OS X that I continue to use Pages. Thus I have no problem with using Pages on the iPad whenever I happen to get one.
For the other people who like Word better than Pages or need it, Microsoft would be stupid not to give it a go. I can't picture it for a while though.
One thing to keep in mind is that you will not see "Microsoft Office for Mac" (or Office for Windows, for that matter) for iPad. At more than one demonstration of Office 2011, Microsoft have been asked and responded to the iPad question by saying that iPad is a different class of device. It doesn't make sense to try and blindly shoe-horn a complete Office suite onto iPad without knowing what people want to use it for, and how they will use it. What they want to do is make Office companion apps that provide the features that people need on a touch tablet.
So, for example, you probably want to run presentations off it, AirPlay-style. But will you need to build Excel pivot tables or VBA? Is a notebook app more important than a word processor? Do you need to organize thoughts more than you need to write a thesis? Do you need all the power of the formatting palette and all the templates? Are you more likely to proof a document retrieved from SharePoint than write one from scratch that no-one else will ever see? (And frankly, even if
you think you do, is that even typical?)
There are
no apps in the App Store that just completely replicate their desktop equivalents. Or, certainly, there are no good ones. iWork for iOS is a different creature because it's designed with devices in mind. So are Things, OmniFocus, AIM, iMovie, iTunes and so many others. Not just because of the resolution, but also because of the way they're used.
For those who want Microsoft to make iPad apps, you need to speak up and tell them what you want to get done on them, how you will use them and in what situations, so they can design and build apps that make sense on the iPad. Not just say "I want Microsoft Office for iPad". Because you will
not see Microsoft Office for iPad that is just Microsoft Office.