Yeah, they're releasing a new model, but it's not a true Plextor. I don't understand why you're feeling so misled about this. I'd take another PX-760A over this PX-800A any day.
The point is that all of their competitors are releasing new models every month. Yeah, there aren't any major changes, but it's not good for business if you sit there and keep selling 16X DVD+-R drives when your competitors are selling 20X drives. Sure, 20X quality blows, but most consumers don't know that. Even if they do, they like to have the option available. Most people are rather simple and equate faster to better. In this case, however, Plextor is finally providing DVD-RAM read/write.