One reason we probably won't see the Skylake-H Xeon in the new Macbook Pro is because the skylake plist that was found on 10.11.4 a few months ago. Xeon procs have Iris Pro
P580 while the i7 only have the 580 moniker. Not sure what, if any the difference is but they are different as far as ARK is concerned. The 580 is on the list though. remember this was released AFTER the crappy march event.
https://pikeralpha.wordpress.com/2016/03/25/os-x-10-11-4-build-15e65-and-skylake-graphics-support/
AppleIntelGraphicsFramebuffer.sh v3.2 Copyright (c) 2012-2016 by Pike R. Alpha
------------------------------------------------------------------------
The supported platformIDs are:
[ 1] 0x191e0000 - Intel® HD Graphics 515..........(ULX GT2)
[ 2] 0x19160000 - Intel® HD Graphics 520..........(ULT GT2)
[ 3] 0x19260000 - Intel® Iris™ Graphics 550.......(ULT GT3)
[ 4] 0x191b0000 - Intel® HD Graphics 530..........(Halo GT2)
[ 5] 0x193b0000 - Intel® Iris™ Pro Graphics 580...(Halo GT4)
[ 6] 0x19120000 - Intel® HD Graphics 530..........(Desktop GT2)
[ 7] 0x19020001 - Intel® HD Graphics 510..........(Desktop GT1)
[ 8] 0x19170001 - Skylake Desktop.................(GT1.5)
[ 9] 0x19120001 - Intel® HD Graphics 530..........(Desktop GT2)
[10] 0x19320001 - Skylake Desktop.................(GT4)
[11] 0x19160002 - Intel® HD Graphics 520..........(ULT GT2)
[12] 0x19260002 - Intel® Iris™ Graphics 540.......(ULT GT3)
[13] 0x191e0003 - Intel® HD Graphics 515..........(ULX GT2)
[14] 0x19260004 - Intel® Iris™ Graphics 540.......(ULT GT3)
[15] 0x193b0005 - Intel® Iris™ Pro Graphics 580...(Halo GT4)
[16] 0x193b0006 - Intel® Iris™ Pro Graphics 580...(Halo GT4)