I think Apple doesn't decide when update its notebooks based on Intel roadmap. The problem with 15" macbook pro was the following. Intel announced i7-5950HQ ( 2,9 Ghz ), i7-5850HQ (2,7 Ghz) and i7-5750HQ (2,5 Ghz) last 2nd June (Computex 2015) , the quad core models with the tdp that 15" macbook pro use. In the conference they said that they would't have good avalaibilty before 45-60 days. Apple couldn't wait so much, because 15" macbook pro is the "top notebook" for the pro consumer, and 13" Macbook pro had already got the force touch(a key innovative feature) since March. Because of that, Apple decided to update its top notebook with the best components avalaible at that moment, skipping broadwell. That isn't bad at all for them, because in the future, when they release the new hypothetical redesigned generation, they could use the comparisons that they love with 50% more cpu performance or 50% more power efficient....
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