The Server chips are pretty much always a generation back, having a development cycle to try to fix any erratum that may have popped up, as well as to do work to rearrange cores, cache, add a good amount of IO, and ditch things like the onboard graphics.
Intel's supposed to be releasing the E5 v4s in the next few weeks, which will be Broadwell based. edit: These are also Broadwell based, supplanting the Haswells they released last year.
Intel's supposed to be releasing the E5 v4s in the next few weeks, which will be Broadwell based. edit: These are also Broadwell based, supplanting the Haswells they released last year.