Yuppers, thats the kind of stuff that can be done with Flash.
Now, to get animated assets to run within MainLobby is dependent on how the programming was done within the Flash file.
If you looked at Cinemar's DVDLobby T3 version, you will see some of this animation in automation. MainLobby uses Flash subtlely in many other areas. For example, when you build a weather scene using the new WeatherLobby 3 graphical components, they have some life to them. The wind direction compass spins and comes to rest on the actual wind direction, the wind speed gauge bounces a bit when you open the scene. All of this give that next level, but subtle, touches that only flash provides.
Of course, it can also be used "in your face" like the neat stuff on that webpage. Programming that takes a good deal of time.