[JJ_SO]

There is one little bit in the rumors that has me worried as an amateur photographer, and excited as a fan of technologies, it's that the lenses will have Fresnel elements (source). This is not something that we see often, as far as I know, there are only the Canon 70-300mm DO and the Nikon 300 f4E PF that are available.

That kind of lens is smaller than standard lenses of the same focal length, but there is an impact on bokeh, flares, halos... and the price of the lenses.

Thanks for linking to the source and pointing that out. I have a bit mixed feelings about fresnel lens, but I admit, size and weight of the 300/4 PF E are small enough to take it with me without a special plan to do long range shots. Compared to some Sigma primes it's lightweight. Bokeh a bit more nervous - but nothing to run away of at first glance...