I bought my second rMBP about 2 months after my first started dying (having given problems since I bought it in June last year). The repair would have taken weeks and I use it every day in connection with my profession. I did not and could not wait (even though my first rMBP has now supposedly been repaired).
The new unit is a completely different kettle of fish. No overheating and no screen problems. I re-installed bootcamp for the first time last night and gaming on it was a revelation.
Thunderbolt 2 controllers are - according to a new article on this site - only going to start being released next year. It seems that Thunderbolt 2 will be a pre-requisite for 4K displays, which, as someone else has predicted, have probably been put on hold by Apple until thunderbolt 2 can be integrated into new units. This seems to me to indicate that whatever refreshed "Haswell" - based MBPs will be announced on Monday, they will not incorporate Thunderbolt 2. I would not like to go out and buy a new MBP only to have it incapable of properly supporting future 4K Thunderbolt Displays sometime next year. In other words, the "refresh" early next year will be worth waiting for.
From my own experience, the current (early 2013) rMBPs may have matured to the point where their initial teething troubles (which I experienced first hand) have been ironed out. The "revised" or "new" Haswell based units which are supposedly going to be announced in the near future may also have teething troubles. As far as I can see, the more drastic the revision to the hardware, the greater the risk of problems initially.
In the meantime, I agree that the processor and graphics bumps represented by Haswell will not be revolutionary. And my current rMBP has more than enough battery life for the amount of time it spends unplugged from my TBDs.
I thought I would weigh in with my own point of view as some of the comments on this thread were disturbingly unsupportive.
