Had a play with Edge over lunch - just a simple keyframe animation (which is all it can really do). First impressions:
- fairly easy to use if not a little cumbersome – adding keyframes/tweens is a little on the convoluted side
- no ability to add interaction
- no scripting ability
- as you'd expect it outputs a lot of files (.js, .css, .html, image files) - in the very simple animation I did the weight of these files was about 250kb. That's about 240kb more than doing the same in Flash. Flash would only be one file (maybe two if you use swfobject.js to embed).
Final verdict – good but I hope for a lot more features in the final release of the software. However – I still can't see how HTML5 will ever take over from Flash for high quality, interactive, rich media delivered via a browser.