Malcolm Owen at AppleInsider mentioned that if Apple adopts Cannonlake, they could offer 32GB in the MBP and at least early-on Cannonlake was to be offered in desktop form-factors with TDPs in the 90W range (equivalent to the i5-7600 and i7-7700 used in the current 5K iMac). However, Intel has been changing their roadmaps on a regular basis, so who knows what will really ship in what process.
Interesting. I think he might be mistaken, but no one knows for sure until Intel confirms things. The take I most agree with (e.g. at AnandTech and Ars) is that Cannon Lake is going to be the first production architecture launched on 10nm+, and due to manufacturing difficulties it's going to be limited to the smallest and easiest to manufacture "Y" chips, which Apple doesn't use on the MacBook Pro. (Therefore, even if it does support more than 16GB of RAM, Apple won't be launching a "MacBook" with more than 16GB of RAM while the MPB stays at 16GB.)
Then, by the time Intel has figured out their 10nm+ process, Ice Lake should be ready to launch. So rather than expand Cannon Lake beyond ultra-low-power "Y" processors, Intel will jump straight to Ice Lake. This is all speculation, but it's informed speculation that makes a lot of sense to me.
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I agree the roadmap is confusing but according to Wikipedia, Cannonlake will go all the way up to 95W. So if thats to be believed, Cannonlake might have some desktop parts. But I doubt it.
So I think what we'll see is
1) CFL being skipped since it won't support LPDDR4/GT3e graphics (at least it doesn't right now) and Apple goes to CNL for MBPs, which would debut next WWDC. And then, because CNL may not have desktop parts, Apple goes with CFL in the fall for the iMac refreshes or better yet, hopefully Ice Lake will be ready by then.
2) CFL chips with LPDDR4/GT3e graphics are made available next year which Apple will then use CFL for their MBP lineup, and CNL for their MacBook lineup (given they are ultra lower power). iMacs will remain unchanged, getting either CFL or Ice Lake, hopefully Ice Lake.
I
think that Wikipedia info is way out-of-date, back before everything slipped by two+ years. The way Wikipedia works is you need sourced information to correct things, and there's been very little verifiable info recently that would specifically correct the "up to 95W" information.
I hope Apple doesn't skip Coffee Lake because it's supposed to be a fairly impressive bump for 15" MBP, increasing to six cores / 12 threads. I'm hoping for a "silent" update which updates the MBP this Fall with CFL and Kaby Lake refresh.
There's also that rumor about Apple offering a MBP with up to 32GB of "desktop" RAM this Fall, which is entirely possible based on available chips. Battery life would go down, but could be mitigated slightly if they figured out how to squeeze that previously planned extra-large battery inside and / or GZO display technology is ready, which saves on power.