I think you're pretty off-base here. Haswell offers - at the same clock speed - somewhat faster processing that requires somewhat less power. That gives manufacturers three choices:
1) Increase clock speed, noticeably faster processing, same power draw
2) Same clock speed, marginally faster processing, slightly improved power draw
3) Slightly decreased clock speed, roughly same processing speed, much improved power draw
Apple chose #3 for the MBA - they dropped the base clock speed, kept the same processing speed and had a huge increase in battery-life. They chose #1 and #2 for the iMac, depending on how you configure the processor (but the numbers are a little less clear when talking about the Iris Pro in the base 21"). Apple is likely to choose #3 for the MBP - and most people are excited about the same processing power with a big jump in battery life.
The wildcard for the rMBP is the display (IGZO?) and whether it becomes more efficient as well (and whether that influences Apple to be more or less aggressive on Haswell clock speed).