Retina iPhone app on the new iPad With the new iPads having a retina display, what will happen to iPhone apps that are built to support retina display for iPhone/iPod touch on an iPad sized retina screen. Will the iPad use the retina version of the iphone app or stick with the normal version?
The German magazine c't (or rather the new "Mac &amp; i") tested the new iPad (3rd gen.) and found that it finally uses retina graphics in the iPhone apps that provide them:


  Übrigens stellt das iPad 3 auch Apps, die für das Retina-Display des iPhone 4(S) optimiert wurden, schärfer und ansprechender dar als sein Vorgänger – iOS zieht nun also endlich die optimierten Grafiken heran. Das wirkt sich positiv auf beide Darstellungsvarianten aus, auf die Originalgröße und den "2x"-Modus.


Translation:

By the way, apps that are optimized for the retina display of the iPhone 4 (S) are displayed by the new iPad sharper and more appealing than by its predecessor - iOS now finally uses the optimized graphics. This has a positive effect on both display variants the original size and the "2x" mode.