Apple seeded the first beta of El Capitan OS X 10.11.6 (build 15G7a) and, for now, the most obvious change is a couple of modifications in the sandbox (configuration) data:
Presumably to combat security issues (with software update). And you may remember the Geekbench scores (1 and 2) with that strange SKLCRB1,1 model identifier. Well. I now have, after digging through AppleGraphicsPowerManagement_Info.plist, reason to believe that they are real and from Apple and this is why:
It may not use the same processor, but this board-id was/is being used for testing. Why else would Apple add Broadwell (the first three) and Skylake (the next twelve) device-id’s to that board-id. A great trick to hide your trails😉
Note that the device id’s 0x1906, 0x190B and 0x192B cannot be found in the frame buffer data. Which is still the same as what I found in OS X 10.11.4 Build 15E65.
And some of the frame buffer data sets, for device id’s 0x1902, 0x1912, 0x1917 and 0x1932 will first need an update before they are fully supported.
Anyway. Next time you see a Geekbench score with board-id Mac-50619A408DB004DA and a funny looking model identifier, then you know what to make of it.
Edit: They used Build 15W4314 during the test runs with Geekbench, which may be an indication that we won’t see new hardware before OS X 10.12 is released (10+12=22 and that happens to correlate with the letter W).