Interesting that apple seems to be following the same model as they did with their mobile devices in terms of developer functionality. Their view seems to be to start off really tightly locked down and then gradually open up additional features to developers. It makes sense in that its much easier to open stuff up after its been locked down then to lock down stuff once people have built stuff on it.
I think this goes well with their other line of thought:"It is so difficult to remove a feature once we've added it, so it is best to be careful adding new features and start with a few great features first." That's how they have developed iOS.
I recall a high-ranking individual (Jobs, Cook, or Forstall) from Apple saying this a couple of years ago, but I don't remember when, where, or context. Sorry.
