Pandora #2 talk has been going on since... forever! Seriously, I can not count the topics anymore that were made for this specific purpose. A second Pandora is at least five years away from now, I'm absolutely sure about that. OpenPandora hasn't even delivered the second batch completely, so why they would even begin with a second Pandora really boggles my mind. There is still so much to be realized for making the Pandora a (lasting) success.
Let's say they deliver all units from batch one and two before the end of this year. After that there's at least another year of development. Then a year of research for wants and needs for the second Pandora, and then at least a year to realize it all. Add in another year for the miscalculations, and you are five years ahead already. By that time there will also be a couple of other new devices in the market as well. But until that time, the Pandora is a pretty unique piece of hardware.