This rumor doesn't make sense, unless the below is completely wrong.
1. "Due to low 10nm yields, Cannonlake will be limited to 15 Watt U and 5.2 Watt Y system-on-chip parts with GT2. Higher power mobile and desktop platforms will receive an update in the form of a 2nd 14nm process refinement, Coffee Lake, that is said to share Cannonlake's architectural refinements."
(
https://en.wikipedia.org/wiki/Cannonlake)
2. "Something else that’s noteworthy is that the roadmap shows the most powerful Cannon Lake-U chips will be 15 watt processors, which means there won’t be a more powerful 28 watt variant.
Instead, Intel will brand its 28 watt Kaby Lake successor under a different name…
Coffee Lake
Coming in the second quarter of 2018, Intel’s Coffee Lake chips will likely include Core i3, Core i5, and Core i7 processors that use between 15 watts and 45 watts of power.
Unlike Cannon Lake, the Coffee Lake processors
are expected to be 14nm chips.
The entry-level 15 watt Coffee Lake-U variant will likely be a dual-core laptop processor. There’s also a 28 watt Coffee Lake-U line of chips on the way, which will probably be a set of quad-core laptop chips.
The 45 watt Coffee Lake-H chips are higher-performance, 6-core processors. These chips are also designed for laptops, but since they generate a lot more heat than Cannon Lake or Gemini Lake chips, you probably won’t see the new H series processors in thin and light notebooks."
(
https://liliputing.com/2016/09/leak...-chips-2017-2018-coffee-lake-gemini-lake.html)
I don't see Apple going to dual-core Cannonlake chips for the 15". Coffee Lake is for the high TDP chips, that's what would be in the 15". Is Kuo saying the 13" is going to be upgraded to have a 32GB option before the 15" will have it? Something doesn't seem right with the picture he's painting. It makes a little more sense if Coffee Lake can use LPDDR4, however that's not what he's saying.
Either way, I think the timeline here is quite optimistic. Intel had a lot of issues making 14nm Skylake. I'm not sure 10nm is going to go much better for them, but we'll see.