Microsoft was quick to issue a denial to the press. "The information shared by our Czech subsidiary is not accurate. We do not have anything further to share at this time." Translation? They are doing it. Maybe a few facts are off, but they are doing a port. It's not a flat-out denial; it's a claim of inaccuracy. That's all the wiggle room a company needs to avoid being called a liar.
It's an acknowledgement of two facts: the iPad is the tablet of choice at the moment, and the enterprise really likes its tablets. At the Tablet Strategy conference last April, Chris Hazelton from 451 Research said its own research showed 78.4% of companies surveyed allowed employees to bring in their own devices. That contrasts with just 18% of employers actually providing their employees with tablets. Supporting iOS and Android means no matter what tablet you use, Office will be there. And isn't that what Microsoft wants in the end?