title: iOS -- require OpenGL ES 2.0 for upgrade?
body: <p>The first version of my app runs on all iOS devices. I'm considering releasing an upgrade which will only work on devices which support OpenGL ES 2.0. Is that as simple as changing the UIRequiredDeviceCapabilities in info.plist? If I do this, what will users on the old devices see when they try to upgrade? Or will they even be notified that there's an upgrade available?</p>
  
  <p>And lastly, just want to double-check that this will work, that it's possible to change the device requirements for different versions of my app.</p>