http://www.nikonusa.com/en/Nikon-Products/Product/Camera-Lenses/2202/AF-S-NIKKOR-70-200mm-f%252F4G-ED-VR.html So it's much cheaper than the 2.8 version, and lighter too.
Yeah, KR speaks pretty highly towards it, stating it'll have better VR and faster AF than the 2.8. Personally, I'm still dreaming about them. The 2.8 has the extra stop in aperture, but, it's also about the bokeh for this lens. $1k price difference leaves a lot more room in the wallet for playing though.
Looks like a new 24-70 f4 is on the way also http://www.canonrumors.com/2012/10/canon-ef-24-70-f4l-is-coming-cr3/