Apple Boosts 3G Download Cap to 50MB ⇥
[The 20 MB cap] causes a problem mostly for universal apps that are offered as a single download for both iPhone and iPad. See, on an iPhone the impact of the casual downloader, who sees an app and has to have it right then, cannot be discounted. These users probably grab the majority of their apps over their 3G connection on an impulse.
Since the iPad resources now need to be retina-friendly as well, app sizes will increase significantly, especially on apps with a lot of custom elements.