No, and you likely will not for sometime. Two reasons. First, HTML5 is not finalized yet. The only real aspect to using HTML5 today is for the video capabilities. Second, not all browsers support HTML5 the exact same way. For example, Mozilla's Firefox browser currently only uses Ogg Theora for video. Safari, Opera, and IE (9) use H.264 encoded videos (which, BTW, is not the same as MPEG-4). IE 8 and below as well as older versions of Safari, Opera, and Firefox do not support it at all. This means that in order to properly support all browsers, one must encode the videos 3 times (one for flash to support older browsers, one for H.264 to support IE9, Safari, and Opera, and once more for Ogg Theora to support Firefox). Until you can encode a video once and it plays back on all browsers, you are not going to see Flash going anywhere from the script perspective.