The extensions for apps look very promising. I don't think Android intents provide this kind of deep integration between apps. But I would wait for some one to confirm that part.
i can confirm that intents are this deeply integrated in android. more so because they are custom, any app can fire or register an intent, so they don't need to be something baked into the OS from the start.
i do like the ideas for extensions apple presented, but they all seem to specific. the android intents i use day to day are way past this.
