It's kinda funny.... after I wrote that last comment, I looked over at my shelves where I have my busts, and the last few "busts" all have arms attached to them. So technically, these aren't really "busts" anymore, but more like half statues.
Don't get me wrong, I love them, and I think adding the arms to them was a great idea, as it gives them a little more life, especially if they are in somewhat of an "action" pose (like Bossk or the Biker Scout). Without the added arms, some of these would be a tad bit... boring (see Anakin, Obi-Wan, Mace and Padme). If they keep going with this new "armed" look, there's no telling what they could do. I wouldn't mind seeing another Anakin, Obi-Wan, Mace and Padme with the arms added, because I'm sure they would look a lot nicer.