Although the iPad mini may be a toss up because it uses Apple's in-house processor, an MBA with Retina screen won't pop up until Intel releases Haswell (and after it's been on the market). Compared to Ivybridge, it's expected to increase CPU performance by roughly 10% and double GPU performance. Furthermore, TDP is expected to be anywhere between 10-65W for the mobile variants, another boon.
Of course, it's certainly feasible right now to give the MBA a retina screen, but not if you want to greatly sacrifice battery life. Haswell will fix this.
Of course, it's certainly feasible right now to give the MBA a retina screen, but not if you want to greatly sacrifice battery life. Haswell will fix this.