I have read through the thread here and thought I would make a couple of comments. I want to qualify this by noting that I am not a tech guru on screen technologies, battery density, etc., but I do look at things from a certain perspective as a customer.
I am a long time Apple customer. In the next room, I still have an Apple II+ and a Mac 512K from the early 1980s. Over the years, I have been a strong Apple loyalist, only using Windows when I had to. But I also recognize that not every Apple product has met its target, at least for me.
I do not agree with those on the thread that basically say to shut up or go buy a Nexus, etc. If we can't have a decent discussion about products and their utility and value, then why are we here? By the way, I see the same things on camera forums, where "fanboys" try to shout down any discussion of their favorite product. It is not productive, in my opinion. Apple is a great company, but they are not perfect by any means, and without appropriate feedback, they cannot make their products better in response to their customers' needs.
Now to the IPad situation. I am an eager and enthusiastic IPad user. But I waited to buy one until the retina screen on the IPad3 came out and absolutely love it. I do use it for photography, mostly non-professional. A quality photograph on the retina screen of the IPad3 is an amazing thing to see for me.
But I also use the IPad for two other major uses. Aviation and travel. As a pilot, the IPad has revolutionized aviation. I can get detailed charts, with inputs of weather and traffic displays on the IPad3 with GPS generated aircraft position and track. It is excellent resolution. The retina display is important to me for that purpose. The more detail the better. And the brightness needs to be good for daytime operations. There is one issue with the larger IPad. That is its size can be difficult to deal with in the cockpit. The Mini is really a better size. But I want the retina display, for its detail. But the range of color is also important, due to the nature of the information that is displayed. So this "gamut" business is a disappointment to me. It can make a difference for this application. I will need to see the Mini retina in person to check the screen myself, as I haven't been able to check it yet. I don't want a screen that is inferior to my existing IPad3 retina.
For travel, I prefer the Mini for its size. But again I use it for travel photography. So again I would much prefer the same quality of screen that I am used to in my IPad3.
I would not be a customer for the IPad Air as even though it is lighter and thinner, it is the same basic physical size as the 3, and has the same screen as I understand it.
Bottom line. I was going to buy a MiniR. But now I will wait until I can see it myself and compare it to my present IPad3. I won't go down in screen quality, unless it is basically imperceptible. especially because the one that I want is the top of the line 128GB with cellular and GPS, which goes for $829. I won't spend that kind of money unless the product does what I need it to do.