I finally got a chance to review this video again, and I noticed one piece of information John shared that I thought was extremely interesting:
He said that in developing future versions of Windows Mobile - whatever and whenever they may be - Microsoft is focusing on data they've gathered showing that if people have to click more than twice to accomplish something, their "success rate," as John puts it, plummets dramatically to below 50%.
This is why, he explains, Windows Mobile 6.1 puts so much information and one-click functions right on the homescreen. And, he revealed that the WM 6.1 Standard "sliding panel" interface was actually "slipstreamed" into the .1 update, meaning that the interface improvements were and are part of ongoing, parallel development and happened to be ready in time for the new OS, which was really focused more on "under-the-hood" improvements than anything else.