AVAsset and AVAssetTrack - Track Management in IOS 4.0

Question

Hi,

The new features list of IOS 4.0 says that AV Foundation framework has got Media asset management, Track management, Media editing, and Metadata management for media items. What do they mean by this?

1. Using track management and media asset management can i access media files from the photos app?
2. Can i make my custom compositions using AVComposition and export and send it to a server?
3. Can i rename, move, edit the metadata information of an asset?

I tried to get some help/documentation on this and couldn't find any thing..

Thanks,

Tony