Laptops as a class of device have always had the reputation of
growing legs and walking off, but with the ever thinner MacBook, MacBook Air, and MacBook Pro designs, finding space for a
Kensington lock is an obvious engineering challenge. Maybe Apple needs to devote some of their human factors engineering to figuring out a completely new anchoring mechanism but I have seen no mention of that on any of the rumor sites — just the continuing drumbeat, "…the next model MacBook/Air/Pro will be thinner, faster, and have longer battery life."
There is speculation on the rumor sites the MacBook Air line will be dropped at the June WWDC having been squeezed out by the ever thinner and more powerful MacBook and MacBook Pro models, not to mention the 12" iPad Pro, which might have been an even bigger incentive behind the store's decision to switch to the MacBook Pro.
