I think people are over-anticipating Haswell because they assume it will have a miracle fix for performance issues with rMBPs. Honestly, I don't think it's the case.
It'll be a spec bump like all others and Haswell entry-level CPUs will be weaker than current's best Ivy Bridge CPUs, which do show some scroll lag. As for the iGPU, it'll also definitely be weaker than a GT 650M, which, again, currently lags.
The only real fix there will be is progressive software optimisation, which already started and will only get better (Safari 6.0.3 is now smoother but still not as much as WebKit).
Basically, all those people saying the rMBP is a "rev 1" product you should stay away from are more justifying to themselves not buying it than anything else. There has been some real issues : display image retention, SMC glitch (now fixed), scroll lag (improved and will continue improving), but people claiming the rMBP has underpowered CPU/GPU will eventually find out Haswell isn't going to be a hardware revolution and it's software improvements that will ultimatly "fix" the rMBP, including this generation.
Now as for the cMBP itself, it's an awesome computer if your plan is to upgrade it one day or another. A SSD upgrade for example is going to make it a lot faster than whathever improvement Haswell will bring. If your eyes can't allow you to read small text, I assume you wouldn't fully appreciate the sharpness of a Retina display either.