I have a 2010 MBA which I've really loved, however the screen quality always left a little to be desired. I'd like to upgrade to a retina display. I'd rather not have to go to a MBP since I love the size of the MBA. Will the next MBA have a retina display? I asked a apple store employee and he thought they'd never put a retina display in a MBA because it would make it too large. Opinions?