The reason this intrigues me is because it could show a major divergence for future lenses for Canon, which would be different than the Nikon path. Nikon has basically no primes with IS (only their 85 macro and >200mm lenses), and I think only one zoom with VR in the f/2.8 range. Their most recent lenses are f/1.8.
Canon on the other hand just released two lenses that are a whole stop slower than their predecessors but add IS. This too would be nearly a stop slower and add IS. The pancake 40mm doesn't have IS, but that seems to be a size thing. If Canon is gonna keep targeting the video market, that might show the path for their future lens updates, making them slower but adding IS. F/1.8 is plenty shallow for most video work, and the IS can be indispensable. But for photo-first people, it'd probably be frustrating to see IS in everything...especially if Nikon is taking the other path