I believe that the following will be needed:
- new placeholders in app xml for the new iPad retina icons
- a mode that will allow the content done in 'non-retina' iPad to be viewed on new IPad (like the tag that makes iPhone 4 to fill 4 pixels and be used as the iPhone 3)
- a simulator for all AIR environments, which allows the visualization of the iPad retina display (I guess it will have to have scrollbars for the first time in a mobile phone simulator, since the height is going to be 2048 pixels :-O )
- anything left on the list?