The main issue I experience is in Safari - with generally rectangular areas not being redrawn when the screen changes. For example if I am running a web-based application that pops up a dialog box, as it closes perhaps some of the area under it will not be re-written. Or I will scroll Safari up, and the left and right sides lose alignment. Sometimes it is filled in after a few seconds, all by itself. Usually I can get it re-drawn by waggling my cursor around in the area that is out of date. This pretty much always happens when I am on the Intel 4000 onboard video.
I have two Retina MacBook Pro 15's and they both do it. Did it from the start, and still do it on 10.8.2.
SMC update is no use to me - says the software is not supported on my system. I presume I must have installed it a while ago, or it came pre-installed.
I rather feel I have been patient. Had one system for a month. I don't need an instant cure - but some info from Apple about where they are in the process, or if there even is any recognition that there is an issue, would be nice. I'm very disappointed that 10.8.2 did not address this issue.