Back when the original ipad came out, microsoft said the reason they would not make Office for the iPad is simply because they refuse to give apple 30% of the sales for Microsoft Office.
So if they were to actualy release it, then they would now be willing to give apple 30% of their sales.
Besides, whats wring with the iWorks apps for ipad? Also I'm guessing microsoft is going to have a much larger price point. You will need to purchase all of them since its not deviced out per app(acording to the picture, if it is real).