1500 new API in iOS sdk 4?

Apple de开发者_Go百科scribes iOS SDK 4 contains over 1,500 new APIs.

Such as

1.Calendar Access

2.Video Playback & Capture

3.In-App SMS

4.Map Kit Improvements

5.Photo Library Access

6.Quick Look

I am wondering what are the other APIs available i.e. the missing 1494 APIs.

I think 1500 is more a marketing number that includes all new classes, functions etc, not only new frameworks and old frameworks enhancements