Just curious does Apple manage to fix the dust invasion problem
for the new iMac? Until then I will stay with my little MBP
It's a little early for that. It's only been about a week since they've started arriving. It will take at least 6-8 months before an official conclusion is reached.
I think you are missing the consequences of one of the design features of the 2012 systems. The display and cover glass are laminated together. I.e. there is no gap between the two which reduces glare (double reflection on the inside), but also prevents dust from entering since there is no gap.