I will believe this when I see it, literally.? ?A throwaway line in a blog, even one of the officially sanctioned Microsoft blogs, is just that.
Until or unless I see a major formal announcement from the Microsoft Office Development Team, I take this with a huge grain of salt.? It would be a 180-degree reversal of a trajectory that's been a juggernaut for several years now.? That is exceedingly rare for Microsoft.