So apparently the ivy bridge i7 3770k will now be branded as a 95W TDP product instead of the originally stated 77W , and will only OC to around 4.6 Ghz (while sandy bridges are seen to clock typically to 4.8 Ghz, and as high as 5.2 Ghz on air). Idle power usage is higher, and so is temperatures under load when compared to Sandy bridge.
Lets say you purchase a 2600k and it overclocks to 4.9 Ghz on a decent air cooler, swapping this out for a 3770k which has ~10% increase in IPC, but only overclocks to 4.6 Ghz on the same cooler. The 3770k will not only run hotter, be more expensive, but only offer a ~3% overall performance advantage in this situation. (Which is significantly less than the overall overclocked performance benefit the AMD FX 8150 offers over the AMD Phenom II X6 1100t)
These issues are simply due Intel's s immature 22nm process, and only time will tell if things get better for intel with newer revisions.