There are a number of reasons for the team to continue selling Pandora's based on the current design for years to come. But once you consider how things went, and the teams financial situation, I can't honestly see a reason for them to focus on a next gen Pandora. Sure, if they wanted they could set aside a fair bit so that there is a smooth transition from the Pandora to it's successor, but for now it seems to make more sense for them to put their focus on earning money rather then burning it.