Well, if I had to guess, I'd say Adobe is moving into html5 in a big way.

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.

A few of them work across many browsers actually. For example, if you enable the right tags you would get Regions in Chrome. Clip paths, canvas paths should work by default, while canvas blend modes should work on Canary and most of these should also work on WebKit Nightlies. Canvas Blend Modes should work in Firefox too.

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.

Well, the point is how do you even tell whether some of them are working? Supposedly Canvas Blend Modes are working in my copy of Firefox, but how can I tell? What's it supposed to look like?

I was pleased to find they all work in Safari 6.1. In Chrome it's only the regions example that isn't working.

Agreed. I have my iPhone with iOS7 next to me, but right now I'm reading HN on my Mac. Demo video would be nice...