Well i'm actually drawing a comparison about the step up from 2nd Gen Sandy Bridge to Ivy Bridge. There wasn't as much a a performance bump as people expected. All i'm saying is if you're going to spend $3K on a laptop wait for the next gen retina MBP. Intel is saying it will boost battery life another 40%. Which means if people are getting 10 +/-2 hours now, it will be like 14 hrs +/- 2hrs. Which makes a much bigger difference. Especially to those people that are graphic design/engineering/architecture people that use processor intensive programs.
Projected improvement is never real.
Plus if you work in any of those fields, you'd realize that your monthly income far offset the cost of the upgrade. In fact, a rMBP is simply a fraction of your income.
Considering people who work in design/engineering/architecture, or in my case, software development, will get a lot of use out of the machine in 7-8 months, I think it's worth it to make the jump now.
Now, if you were a student looking to get this machine for... whatever reason you may have, then yeah, it's good being cautious. But really, 7-8 months is a very long wait. You can get a lot done on a rMBP during that time.
i have rmbp, and would not recommend anyone upgrade to rmbp unless you are doing video or 3d rending etc type of work.
image retenntion and overheating are two major problems, especially for gaming.
Well, then... do less gaming? I have never had the fan rev up during the time I use my rMBP for AutoCAD, Photoshop, Xcode, etc...