Thanks for catching that; Jason Langone's comment (from his recent article on SystemsArchTECH.com) is that this video is "indicative" of the great results he experienced with HDX MediaStream for Flash, but it is in fact a video of HDX MediaStream delivering a video via Window Media Player, which we've supported for a long time. I've edited the post to make this clear to future readers. Hopefully someone will do a comparison with a Flash video soon! 

I checked directly with the author of the YouTube video comparing HDX MediaStream and MMR  (Michel Buis, an IT consultant in the Netherlands), and here's his reply:

"I've double checked with my colleague just this morning if we did enable the MMR feature with VMware View, but he said that it is on by default so it was on when we performed our testing.

The fact that VMware's MMR does a poor job in playing the Big Buck Bunny video surprised us very much too. The format that was used in the video was AVI Microsoft mpeg4, with mp3 stereo sound. That's the format that should perform well with MMR (and HDX too of course). I did some further research on the subject and upgraded Windows Media Player from version 9 to version 10 on the VMware View client. After that the video ran smooth with one very big exception....! It only displayed half of the lines that are used, so effectively it only displayed 240 lines instead of 480. I think that's called interlaced, but correct me if I'm wrong. Well.. That's one way to make a video run smoothly, right?"

Perhaps there is a way to improve the experience with MMR, but the key point is that HDX MediaStream was able to play the video smoothly, and HDX MediaStream for Flash can do the same for Adobe Flash content.

No news yet. We have WS08 64-bit support up and running in the lab but we're still working through our planning for a possible beta refresh or Early Release prior to General Availability.

The network latency between the user device and the media source doesn't matter (that is, the effect of latency is no different than it would be if you were running Internet Explorer and the Flash Player directly on the endpoint without this new technology). But the latency between the user device and the Citrix server must be low. As noted on the download page, "This trial release has not been optimized for network latency. Best performance requires a low latency network connection, generally a Local Area Network connection, between the user and the Citrix server." We recommend that you evaluate the trial release with 20ms or lower network latency between the endpoint device and the XenApp/XenDesktop server. As we take this technology to general availability, we expect to improve its latency tolerance somewhat; but above a certain to-be-determined latency threshold, HDX Adaptive Orchestration (specifically, SmartRendering) will automatically revert to server-side Flash rendering to ensure the best user experience possible under the particular network conditions.