Cinema Black Pro is a sub-menu on the VPL-HW65ES that offers two controls. One is the lamp power - High or Low (most projectors call their low lamp modes: Eco).
The other is Sony's dynamic iris. No change in Contrast ratio over the older HW55ES.
Are the black levels any better?
Tough call. Of course I haven't had an HW55ES here in well over a year. I'm thinking that maybe, there's a slight improvement, but that is based on a quick side by side with the Epson Home Cinema 5030UB.
I do believe there has been some change to the irises' algorithm. It used to be that when I would view a very dark scene (like our Bond night train), the pause icon had virtually no effect on the iris, but with the HW65ES, the iris definitely opens up a good bit when the pause icon appears, much as it always has on Sony's $25K+ VW1100ES. (BTW, the pause icon is even a smaller icon now that I'm using a PS4, not my old PS3, so I was surprised to see so much of a reaction by this Sony's iris.
Even if the contrast hasn't changed, I therefore expect that dark scenes are being handled slightly differently. My general feeling is that the HW65ES is, on really dark scenes, perhaps a tad better than it's predecessor, but it may be "more different - than better."
What makes Sony's iris configuration both interesting, and especially flexible, are the options.
You can set the iris for Auto - which is dynamic mode, or you can set it for Manual which gives you a slider control with a range from 0 to 100. For those who find the image too bright when watching a movie in their theater (on a relatively small screen), without ambient light, you can just dial down the brightness. The HW65ES produces 900 lumens in Low power, so it's unlikely you would need to, but at full power it's got over 1500 lumens calibrated, so setting the iris to manual allows you to lower the overall brightness.
The VPL-HW55ES offers up excellent black level performance, superior to most sub-$5000 projectors
Now it gets interesting, because there is one other mode. That one is called Auto Limited. This mode limits the maximum the iris is open, to what you set in the Manual area. From there, the iris functions dynamically. In other words it works just like normal, except you've managed to lower your overall brightness. A very nice touch for those folks with smaller screens or very high gain ones.
Iris action itself is very smooth. I've rarely noticed (except on movie credits and the like), except when really trying to spot its action. I'd say it's on par in smoothness with Epson's dynamic iris action which is very good. Great blacks are important, most projectors (even ones a fraction the price of this Sony), can look great on bright scenes. It's the handling of very dark scenes that separate great projectors from the rest. And while the difference may not be "night and day", you could say that it is the difference between "night and dusk."