https://www.cnet.com/news/macbook-air-2018-specs-price-release-date-rumors/

While the company has made incremental updates to the the MacBook Air during the past eight years, it's more or less the same essential device it introduced in the Fall of 2010. Suffice to say: A major makeover is way overdue. The current 13-inch MacBook Air, released in August 2017, is nearly identical to its 2015 predecessor save for a microboost in the speed of its antiquated Intel CPU and a belated doubling of RAM. 

In the interim, Apple has expended plenty of attention on the premium MacBook Pro line, regularly refreshing internal components and introducing innovations like the Touch Bar. Just this June, the company delivered a new 13-inch and 15-inch model. That enterprise hasn't been flawless, however, as some recent-vintage MacBook Pros have been the subject of complaints and class action lawsuits due to concerns with their ultra-flat butterly keyboards being rendered inoperable by a literal speck of dust. Despite an official denial, this brouhaha may have prompted Apple to retool the Pro line before releasing a new MacBook Air.