I noticed something even odder when I was updating Instapaper from 4.2.2 to 4.2.3 on my iPad 2, iOS 6 beta 2 yesterday: Instapaper is about 25 megabytes, and I'

I noticed something even odder when I was updating Instapaper from 4.2.2 to 4.2.3 on my iPad 2, iOS 6 beta 2 yesterday: Instapaper is about 25 megabytes, and I'm on a desperately slow network. It should've ended in no less than 5 minutes, but it just took over 15 seconds. I'm certain that I'm on iOS 6 ( :D ), and I'm certain that I updated Instapaper (4.2.2 crashed on lunch in iOS 6, that's why he sent out 4.2.3 and now I can open Instapaper), and that my network is slow and it shouldn't have taken less than 5 minutes. So, what's the story? To my knowledge, delta updates are still not available to iOS apps for some reason. And I couldn't find anything about them in devforums/iOS 6 docs/WWDC sessions. So, could it be relevant? Maybe they were testing delta updates by mistake and some apps got burned?