I was wondering the same thing. This is pure speculation on my part, but I'm wondering if the problems that seem to be so prevalent in the F-series are the driving factor in the low prices. I first came along a photo of the f900 in another automotive forum. Some googling of "f900bt review" brought up some pretty horrible reviews. Granted, many of the issues people were having were cured, or at least improved with the 2.0 update, and the hours of hard work by some of the dedicated modders here have made the F-series an even more impressive product, but most people do not want to buy a product that needs to be extensively modded to perform at what they perceive as an acceptable level.
I read many reviews before deciding to purchase the f900, and there are many people who went so far as to say Pioneer made a shitty product. While I don't agree with this 100%, I am inclined to agree that Pioneer released a product that should have still been in it's beta phase. Simple features were left out (no "track up" in 2D mode, etc.) that are included on even the most basic portable GPS units.
I have to admit that the lower price was a key factor in my deciding to purchase my f900. My new came with factory Sirius, and I have been a long time XM subscriber. I decided to drop the factory stereo and get my XM back. When I found out that I could purchase a nav system for almost the same price I paid for my original XM setup (I was a very early XM subscriber, and the "new" technology was still quite pricey), I decided to go for it. The Kenwood systems were nice, but a little bit more than I was looking to spend.
And as far as "Is Pioneer coming out with something new?".... You bet they are! Do we have any idea what it might be? Nope. The integrated hard drive concept is nice, but most people looking to have a consolidated music collection on hand already own an iPod. Given the option of iPod vs. busting out my entire CD collection and re-burning it to another hard drive, the iPod adapter wins hands down in my book. I don't see the hard drive technology catching on until the head unit comes with software allowing the owner to connect the ipod once via USB, and transfer the music collection automatically.
If I had to place money on the future of car audio, I would say the next widely adopted technology will be integrated wireless internet. A common operating system would allow developers to release applications for car audio receivers similar to the iPhone app store. Internet radio could potentially kill off satellite radio if implemented effectively. Just think about the money major corporations would pay to have their commercials played at exactly the moment your GPS senses you are about to drive past one of their retail locations!
But I digress. That's a topic for another thread entirely!