Many points in this article are wrong or at least misleading. There will be no 2x zoom button on apps that are not retina-optimized, they'll be scaled automatically like iPhone apps without retina graphics. The 2x button on iPads was for running iPhone apps on the iPad. Nothing will be shown "smaller" because that's not how retina screens work. Have you ever seen an iPhone app shown at 1-to-1 pixel resolution on an iPhone 4, occupying only part of the screen? Of course not.