I agree with
Sean76 - what issues? The vast majority (as with any other model that sees complaints posted) are fine.
I just purchased (2/16) the 15" rMBP (mid-2012, mfg. November) 2.7 GHz, 16 GB, 768 GB model and it's as perfect as I can detect (and I'm
very picky). No display issues whatsoever (no uneven lighting, tints, dead pixels, or any other artifacts).
As much as I've liked other MBP's and PB's, especially the Unibody (I previously had a UB 17" Early 2009), this is the best yet. It's a very nice refinement of what is becoming a "classic" Apple design. The lightness is incredible for such a capable machine (I'm going from 6.6 lbs to 4.4 and it's very noticeable when it's been on my lap for a while). The thinness is amazing, though less important to me. Even the subtle change in the thumb relief in the front (where you open the lid) is noticeable (they've changed the angle).
The machine runs relatively cool, even when under heavy use (cooler than the 17"). The fans are quieter and less objectionable than the 17" I had (not that the 17" was really noisy).
Yes, there will be another "tick" from Intel (or is it "tock"? I never get that right

), though new models using Haswell most likely won't be released until Fall, 2013. If you're in the market now, I wouldn't wait - there's always something else coming within a year. Ivy Bridge is still a great architecture, and the process "tock" to 22nm results in lower power and temps, while keeping the performance of Sandy.
I say if you're ready now, get it. I was going to wait until next fall myself, especially having just put a SSD in the 17" last Oct., but the mid-2012 rMBP was a deal I couldn't pass up and I'm glad I didn't.
I don't know about Kessel runs, but "It's fast enough for you old man." applies - for me anyway.