In addition to opening up its doors to the public, the beta adds a few new features that are sure to frustrate us the next time we try to use it (I kid). There’s a new embeddable player, better support for Windows Mobile-based devices, and a groups feature. Basically, you can make it so that viewers have to be part of a certain group—The Kop, to invent one—to view videos. It’s one of them there privacy features.
Similarly, you can create ad-hoc groups called Events, whose whole raison d’etre is for things like press conferences or concerts or whatever. Short-term groups that don’t necessarily have to be around forever.
The list of compatible devices can be found here, again, whenever the site comes back.