For starters, let me say that I'm not trying to stir up FUD here, and I have no insider information into Apple's plans regarding iOS4.2... I've noticed that the topic of running iPhone 4 apps with retina display support on an iPad with iOS 4.2 hasn't really been specifically covered by Apple, unless of course I'm an idiot and I completely missed it, which is entirely possible. Currently these apps are run at 320x480 res, with the option of pixel-doubling to 640x960. It is my belief that iOS 4.2 will bring support for running retina apps at their native 640x960 resolution, but I haven't seen any direct confirmation of this. I wonder though if it would be in the best interest of the iPad to allow this. Do you think it would take away the impetus for developers to create iPad native resolution apps if they could just create retina apps and display them at close to the native resolution of the iPad?