At least until recently, they would have been hard-pressed to do a refresh - Broadwell had basically no non-low-power SKUs for a long while, so you wouldn't wan

At least until recently, they would have been hard-pressed to do a refresh - Broadwell had basically no non-low-power SKUs for a long while, so you wouldn't want one in your MBP. So they'd need to refresh with Skylake, which would add lead time, particularly with how long it took to ramp up Skylake manufacturing yield. Meanwhile, if they were going to leverage anything from Skylake for OS X features (looking at you TSX-NI), they wouldn't want to refresh the desktop until they could get it there too, which would probably mean Xeon E[57] v4, and that only came out this quarter.[1] So I'd probably blame this current delay on refreshing on a ripple from Intel's Broadwell/Skylake timeline debacle, and Apple deciding to merge any intervening hardware upgrades into the next iteration forward. [1] - The slight oddity with this logic is that the Xeon E[57] v3, Q2 2015, _does_ have working TSX bits, so they could have conceivably shipped that, even though it's "technically" Haswell. Maybe they got scared when Intel had to use the chicken bits to disable TSX in the first Haswell revs? [2] [2] - http://www.anandtech.com/show/8376/intel-disables-tsx-instructions-erratum-found-in-haswell-haswelleep-broadwelly http://www.anandtech.com/show/8376/intel-disables-tsx-instru...