With Haswell, you’re going to see a big push for energy efficiency. The name of the game right now is mobile. While I like to think the desktop (especially the enthusiast desktop) market is still here for showing the best of the best, and what these CPUs are capable of when you build a balls-the-the-wall system around them. As you can see, Intel did tweak quite a bit with Haswell and, while not earth shattering, should still give some noticeable performance benefits. However, while there is increased performance, energy efficiency appears to have been their main focus.