I honestly don't get this either, and i'm not a fan of it. Don't get me wrong, the SB-E is a beast of a CPU -- but I just can't understand why intel is releasing the E/X parts with old technology. Intel certainly has the ability to release hexa core versions of the latest parts instead, so why not? I mean, Haswell as a hexa core would bring about tons of benefits to the platform, such as increased efficiency and better overclocking as compared to the IB architecture. This *could* also potentially give intel more revenue, since they can release new motherboard chipsets with additional features that were absent on X79, such as RST SSD caching (absent on x79) and Sata Express (successor to Sata 6GB/s). More revenue and potentially more buyers of the platform as compared to IB-E.
So yeah, I don't get their way of thinking on this -- why don't they? I probably *would* go with Haswell-E if it were being released this September. But IB-E? Eh. I dunno. There's a good chance I'll just get a 4770k and call it a day.