They just recently brought out the 70-200 f/4 with newer VR tech. It's half the weight and price. That improved VR will no doubt be used in future for any update versions directly on the 2.8, but can't see them doing it anytime very soon.
If I was buying again [sold off a near new VRII afternot using it near as much as I thought I would] - I'd get the f/4