I'm sure we will see "repair kits" pop up soon that contains a roll of tape with some foam layered in and some sort of tool to loosen the screen out. So what, we need to use 4 strips of adhesive tape to put the computer back together? I will gladly take that. Here is my reason based upon my own experiences:
The 07-09 iMac (the first aluminum model) was a pain to get inside of. The glass panel needed to be removed with suction cups. Then it needed to be gently placed aside and covered to avoid dust/finger prints. Next,
12 screws need to be removed carefully to take the front aluminum case off. This is interesting considering one slip up can result in a screw dropping onto the screen or a screw driver hitting the screen. After removing the front panel, there is then 4 wires and 2 more screws. Next there is 8 screws to remove the actual LCD screen followed by 2 power cables that need unplugging. There, now you're inside!
Things got a little better with the 09-11 unibody iMac. To get inside of that model it consisted of removing the front glass panel, and carefully putting it away somewhere to avoid dirt/dust. Next, 8 torx screws need removing. Again, a similar situation where one slip up can result in a screw or screw driver hitting the LED screen. Once those screws are out, then the screen needs to be carefully titled from the top and 4 connections need to be removed, including a very delicate display connection. There, now you're inside!
The new 2012 iMac seems to consist of removing the adhesive tape and disconnecting what looks like 3 connections. Display, power, temp sensor of some sorts - iFixit wasn't very clear on what cables to disconnect on that particular step, either way it looks way better than the past two generations. There, now you're inside!
Slap some new adhesive to the screen or to the iMac chassis, plop the screen in. Done. No dust behind a glass panel. No finger prints behind a glass panel. No nonsense.
Sure, it would've been great to have this thing open up nicely, but really how much stuff are you changing in and out of an All in One machine? I will open mine after 3 or 4 years to breathe some new life into it, then I will close it and leave it that way until I probably sell it.
If you want a machine to swap components in and out of, hang on tight for the 2013 Mac Pro.
Although lets hope they don't glue the side panel down