First of all, even an iPhone 3GS is a very, very expensive phone for people in the developing parts of the world. Those of us who have grown up in an industrialised nation tend to forget that very easily, since our view of poverty is that of a relative poverty and not absolute poverty. Even our poor would be considered really well off in most places...
Going in to the "a whole new world developing", I think it has to do with the converging of iOS and OS X. That it'll be easier for developers to port an application from one OS to the other, that the syncing process through iCloud (which apparently is a real PITA) will be a lot easier to implement and so on.
The "new world" being the "fusion" of the two operating systems. Maybe they'll even introduce some kind of intermediate OS meant for iPads, which would go hand in hand with the recent development of tablets that can be used as notebooks, or vice versa, using a proper operating system.
That's my guess. The converging of iOS and OS X either by pushing them closer together, or by releasing some kind of iOS X for iPad, because the iPad is done being just a big iPhone with no phone app.
