YoAndy :
The real drive behind the move is to bring 6 core to mainstream users. We expected that the motherboards had to change, they cant made them compatible with the Z170 and Z270 because the older chipset on the previous Mobos are designed for up to four cores and 2400 MHz, and new mobos are designed for up to 6 cores and 2666MHz.
Intel isn't some benevolent savior of HEDT computing. They are a business. Don't mistake my intent behind what I say, I only buy Intel right now for gaming and own a 7700k myself. Any business with shareholders to report to though has to maintain a certain amount of growth for fear of losing investor interest.
This move to 6 core CPU's in the sub $400 range isn't something Intel couldn't have done a few years ago. They just had no reason to. Beside the fact that developers don't often optimize for multi-core work loads (outside media and professional work applications), they had not real competition for the last 10 years. This lack of competition caused Intel to fall into a pattern of non-innovation and only pushing the clockspeed up in their CPUs bit by bit while staying in roughly the same thermal envelope.
If you need more proof that Intel isn't out to bring high performance computing to the common man just take a look at their track record since the debut of the Sandy Bridge line:
-Intel has stopped soldering the IHS to the CPU die. Micro fractures and too small of a package are not relevant excuses with the type of thermal cycles that CPUs go through and the fact that AMD did it on the 14nm scale profitably.
-The Skylake X line introduced the dongle that you have to purchase to RAID M.2 drives if they aren't sold my intel.
-And now a new launch 9 months after the last and they claim a new chipset is required.
I don't work for Intel so maybe I'm wrong and they couldn't have done what they have done any differently. However, their bottom line is money, just like every other computing business. with the process of R&D you can't possibly still say that this release of Hexa-core processors isn't completely reactionary and the fact that it only took them 9 months isn't because they had the ability to do it at this price point all along.