Looks like that rumor was bogus:

"As pointed out by Ars Technica's Andrew Cunningham and others, Kuo's outline of chip possibilities does not match up with what is known from leaked Intel roadmaps. Intel is not planning MacBook Pro-class chips in the Cannonlake family at all, and Coffee Lake chips aren't arriving until 2018."

Thanks for pointing that out. I hadn't seen the update at the bottom of the article.