I just noticed that Plextor Japan has moved the Premium2 to the “old devices” section of their product web-pages. Only the USB variant Premium2-U remains as an actual product. This goes hand in hand with the disapearance of this drive from online-stores over that last months. It looks like the production has stopped somewhen in late 2009.
So anyone who was thinking about getting one of these better hurry and grab one if you can still find one, because it looks like this time there will be no replacement.