The MacBook Pro, 12-inch MacBook, and possibly the MacBook Air are due for a update in June at the WWDC. Many news sources and Mac rumors sites point to this.
Bloomberg cited this week:
"The MacBook Pro will get a faster Kaby Lake processor from Intel Corp., Apple is also working on a new version of the 12-inch MacBook with a faster Intel chip. The company has also considered updating the aging 13-inch MacBook Air with a new processor as sales of the laptop, Apple’s cheapest, remain surprisingly strong, one of the people said."
If this is true, we expect a usual “refresh” for these products and nothing “groundbreaking”. The 12-inch MacBook could possibly get tweaks/changes beyond that. A refresh to the aging ancient MacBook Air would be a surprise, as Apple -- when it announced the new MacBook Pros -- seemed to imply that the cheaper non-Touch-Bar 13-inch MacBook Pro would take the MBA’s place.
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