I have yet to find Plextor officially posting information about this drive (the 605a). PC watch Japan (a most respectable news site) has posted information for a new upcoming Plextor drive: the PX-605A. The Drive supports -/+ rw standard along with dvd-ram (a first for Plextor). The drive looks to be based on the Matsushita corporation multi-drive platform. Its very odd plextor is going to release this drive, especially from panasonic.
Here are pics of the drive and its reference unit
Story and info was found here:
Does this mean that Plextor is going to bring DVD-ram capability to its future offerings?