KGI Securities analyst Ming-Chi Kuo, a reliable source of Apple rumors, said in April that Apple was planning to roll out updated MacBook Pro and MacBook Air models at WWDC, both featuring Intel's new Haswell processors. But rather than kill off MacBook Pro models without Retina displays, Apple will keep them around because they're selling well. (In fact, the 13-inch MacBook Pro is the bestselling product in the MacBook line, according to Kuo.)
The Haswell family of chips has a low-power design that promises better battery life and modest performance increases. Intel is officially unveiling its new chips this week -- perfect timing for Apple's launch of the Haswell-equipped line of MacBooks.