From what I understand, Poser Artist is nothing (or very little) more than Poser 4 in new wrapping. In other words, it has replaced Poser 4. I don't think it's an upgraded Poser 4 in the current state, but the idea is to develop it as a new product line based on Poser 4 technology. Kind of like an entry level Poser for those not interested in the more advanced Poser 5 stuff.