Still, neat to see that Apple is shipping some of Adobe's new prototype css/canvas features. They seem pretty useful.
1) They want to show they are a leader.
2) They want to encourage iOS app developers to use these features now, instead of, or along with native code. After all, Apple will have 85-90% of its devices upgraded in 6 months. You can make an ios7 only app and ship today. 50 million people are using it.
3) They want to encourage further browser adoption.
I could have posted a screenshot but I thought it was nice to have people play with the demo within the browseer, probably will stick to screenshots next time.