Nikon's past video camera foray wasn't very successful. They have to get it right this time and they know this! I know the Fmount could still be used but eventually they will have to do something "revolutionary" and to me that means a new class of dedicated video lenses.
Unfortunately, everything seems to be pointing toward either a 4/3rds or APS-C, de facto, "standardization" for camcorder form-factor V-DSLRs. Panasonic's AG-AF100, Sony's EVIL product line, and NR's own blogs reporting on Nikon's own patent activity. Panasonic's product manager for the AG-AF100 exclaimed, "4/3rds is 'almost' as large a S35!" However, we're still left with a whopping 2.0x crop factor when using Nikon glass on the 4/3rds format.
So, it may be a possibility that Panasonic, Sony, Canon, and Nikon, all may assume the the same sensor format for the next generation of V-DSLRs, allowing for some economies of scale for lens manufacturers, Fujinon and Canon. If such a new product category comes to pass, I would expect both Fuji and Canon to introduce "industrial" quality, TV-style zoom lenses for these products in short order.
One of the first things my wife asked me when I let her use an Olympus PEN camera was, "which button do I press to zoom in?". "You just twist the lens," I replied.
Another cameraguy at work wanted to check out my D90 the other day, and then immediately proceeded to grind the AF gear on my D90 as he grabbed the lens barrel and tried to "focus" my AF 50mm Nikkor f/1.4D . . . grrrr!