This is a significant announcement. Sony and Fuji are making rapid advancements on ILC's that are making them excellent alternatives to DSLR's, at least for non-action shooters.
I just purchased a 6D 9 months ago and am very happy with it, so I will not be looking for another camera for several years. I am also heavily invested in Canon EF lenses. If I were just now looking to upgrade to FF, the A7R would receive heavy consideration.
We still need to see how these cameras test once they are in users hands, but based on Sony's recent history, I imagine they will be great cameras.