Rumors on the Mac Pro coming soon, so who knows, the new display would almost have to release along with it.
I don't envy your waiting game.
This seems unlikely to me. If they were going to implement Sandy Bridge E, it would have happened at least by the first quarter. Waiting for Ivy seems weird, but I can't think of any other explanation at this point. That would mean Q3 at the earliest. Q4 seems more likely.
If it ain't broke, why fix it?
They updated some of the screen treatments with the imac to reduce reflectivity. For those that want a second display with their imac, one that matches would be ideal. For everyone else, less reflective is still better.
The new iMac 27" panel has a similar color gamut to that of the Retina MBP, i.e. ~70% Adobe RGB. Now that's a big drop in gamut from 95% Adobe RGB of the current panel, and a big boon to all who need that extra gamut. And quite frankly that's one of the biggest reasons why anyone would plunk down a grand for a professional display, and Apple has the sense to keep that selling point there.
It's an sRGB display, so roughly 70-75% Adobe RGB. Really gamut past sRGB isn't as big of a deal as people want to make it. Performance at the required brightness levels, shadow detail, uniformity, stability, warmup time, and color temperature (as well as consistency of color temp from light to dark) make a much greater difference. People just make the mistake of thinking wider gamut = more accurate, which isn't true at all.
Unless Apple wants to move away from the professional sector, and at that price point the Thunderbolt Display is there to stay, it's not putting a cost-ineffective component in an already great display.
The thunderbolt display isn't aimed at the professional sector as far as displays are concerned. It lacks the hardware calibration features available in some displays aimed at such markets (video, graphic design, medical use, etc). The design is really that way to extend the functionality of a notebook with the extra ports and short cord. If you were looking for something for graphic design or color grading or anything of that sort, there are better alternatives depending on your requirements. Reflective displays are really bad for a lot of that stuff simply because of how it works. Displays have a non-linear gamma. Reflections off the surface of the screen do not follow the same rules. They are relatively additive in terms of brightness. Even with anti-glare displays, consistent brightness levels are highly preferable.
Plus, how higher can you go from 2560x1440, when the ATD already outresolves the eye from the average desktop viewing distance (i.e. ~2 feet)? Apple didn't boost the resolution on the iMacs for a reason: it's a useless waste of graphic prowess.
That isn't true. I'm not going to debate vision, but did you notice the early problems with the 15" rmbp displays? A 27" display is much more complicated. Bad units become a much more costly problem, and seeing as they used a non-generic design there, it's likely that they would need time to learn from that prior to trying it in a 27" display. Cost was probably another problem. As far as what they would change, it would be the same things in the thunderbolt display that changed in the imac.
The same review also states that there probably was an error with the reading as the display panel unit has not changed from the ACD, which had 85-95% coverage of Adobe RGB:
Your statements are incorrect. I've used them and measured them. They're pretty close to sRGB, albeit not quite D65. Apple never went to Adobe RGB displays. People just misinterpret things when they look up panel numbers. There are some implementations using similar panels that are roughly Adobe RGB. I own one. Until recently those were only CCFL backlit implementations and a couple
very very expensive RGB-LED units. Apple didn't do either. The cinema display was also an sRGB display, although if you're really concerned about color reproduction, buy an NEC instead. The PA displays are better designed and tend to be more stable, even though they make better use of a similar panel. IPS panels are all just oemed from LG these days anyway, but some models incorporate features to aid performance. For example NEC and Eizo sacrifice a small amount of contrast to even out uniformity. Both have internal LUT systems.