This discussion all centers around the leak of information regarding the forthcoming models with the cryptic "intelligent aperture" feature.
If JVC did add a dynamic iris they wouldn't need it to have the level of range as a Sony, because the panels are already natively that much better. But I do agree a true fade to black would be very odd. Imagine the credits where the name appears in the middle and then it goes black, and then the next name appears, then it goes black. It could look very odd indeed If the light was totally muted during the blank bits and it would not look natural.
So what else could this feature be? The only thing I came up with which I mentioned previously, is a feature particularly suited to the 2 higher models (which have the snap-in colour filter), to equalize the light output as you change projector modes. So if you use a preset with a filter, vs one without, vs 3D, that the aperture automatically adjusts to compensate for the light disparity between modes so that you see a stable light output.
If it is a dynamic iris, I would have expected JVC to advertise their new models with the new contrast figures, but so far the published numbers look similar to last years. JVC is no strange to playing the numbers game. Lumens are always expressed in a mode that is not desirable and is far away from D65. Contrast is based on the aperture being fully closed and long throw. When the aperture is fully closed on the higher models with dual aperture, the light output is very low (much lower than the aperture closed on the lower models). Therefore they achieve a higher contrast, but for many it is unusable due to the low light output. So I am sure if JVC had added a dynamic iris, they would be quoting some silly contrast numbers instead!
Well, we will know very soon indeed now.....