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The new 85mm f/3.5 has VR-II, internal focus, and is a DX lens. According to two well-respected lens experts, the MTF graphs show that the new 85mm is, theoretically, the best Nikon general photography lens ever made in terms of optical performance. Literally, the best general photographic lens Nikon has ever designed (excluding the Repro-Nikkor lenses and the stepper lenses,etc). Of course, the theoretical MTF graphs do not take into account loss of contrast and flare in the real world--but still--this new lens is designed to have incredibly high optical performance. As in really,really,really good. And that makes sense, since that is what high-megapixel, high-density 1.5x DX sensor bodies demand--an extremely high-performance optical design for ultra-densely packed, small-pixel sensors.
Just like the 14-24mm AF-S Nikkor is the best wide angle zoom ever made--better than almost any prime lens in its focal length from any manufacturer, my suspicion is that the new 85/3.5 was designed for the FUTURE cameras and sensors Nikon has planned, just like the 14-24 was. Expecting that the next generation of Nikon DX bodies will be at 16 to 18 megapixels, up from 12.2, I expect Nikon designed the new lens with f/3.5 as max aperture and as 85mm to maximize total,overall performance of the lens, while still coming in just over $500 in price.
Nikon has made older repro-Nikkor lenses capable of resolving 600 lp/mm with visible light, and specialty lenses capable of resolving over 1000 lp/mm within the green light spectrum; if pixels drop to the Canon 7D size, of under 5 microns, in future Nikon DX bodies, the 85mm DX Nikkor might be the lens to have for critical macro work. Nobody knows, yet, just how good the lens is on an actual sensor, but I think I understand why Nikon designed this lens as a DX,and an f/3.5, and not overly long--above 100 and to 120 and 150 and 180mm, it becomes necessary to have a true apochromatic design, which costs more money--the shorter focal length of 85mm will minimize the chance of chromatic aberration that would need to be corrected.
A slower maximum aperture makes the lens physically smaller and lighter,and easier to design, and that keeps the weight, and the price both more in line with what people want from a DX lens. By keeping the max. aperture at f/3.5, it's easier to optimize the lens from wide-open, which is a very reasonable f/3.5, down to the common macro apertures of f/8, f/11, etc.
With higher-MP sensors, it is important that a lens designed and optimized for a densely-packed sensor be *very good* to even *excellent* at wider apertures like f/4 to f/4.8, f/5, in those ranges slightly wider than f/5.6. For example, on the D2x, which is a 12.8 MP sensor with 12.2 effective MP, the pixels are small and densely-packed: with a 12.2 MP sensor, diffraction begins to affect overall image sharpness at f/5.6, and so for future sensors that might be 18-20-24 megapixel's on DX, it is almost essential that the lens performs *brilliantly* at f/4 to f/4.5--otherwise, why even use a high-MP count sensor camera?
A good example is the Nikkor 45-P f/2.8 lens; it is an f/2.8 lens, but even wide-open, at f/2.8, its optical performance is the best of any of the Nikon 50-mm normal lenses which are f/1.4 or f/1.8. The absolute, sharpest 50mm lens EVER tested by Popular Photography was the 50mm f/3.5 Heliar made by Cosina in Japan. A slowish-design, like f/3.5, is easier to optimize and make really good than a high-speed lens, especially with a target price of $529.
Since a macro lens is often used stopped down to f/8, there's not that much advantage to making the lens f/2.8--that would make the lens larger, heavier, and wide aperture just isn't that needed for a macro lens. Besides, with most macro lenses like the Tamron 90mm f/2.8, the maximum aperture drops to f/3.5 anyway, when focusing close, and drops down to f/5.6 at 1:1, or a two-stop loss of aperture speed. Not sure how this lens will be designed, if it will have a constant aperture and lose a little focal length as it is focused closer (losing focal length as a lens focuses closer is normal) is my hope. The lens is due any day now.