Apple is sure to announce a variety of new products at its Worldwide Developers Conference next week and a recent leak from 9to5Mac confirms that the company will refresh at least one of its MacBook lines at the annual event. The website obtained SKU information for an unreleased MacBook model and speculates that both the MacBook Pro with a Retina display and MacBook Air may see updates. The latest rumors point to a slimmer 13-inch Retina MacBook Pro with a full HD iSight camera and Intel’s new Haswell processor. The MacBook Air is expected to see similar updates to its internal hardware, along with a better front-facing camera and an improved microphone system. Apple’s Worldwide Developers Conference is scheduled to take place on June 10th in San Francisco.