Wow. This sounds like a pretty nice camera. If the image quality and low light capability come through it would prove to be a good all around camera. Max f2.8! Pretty neat.
I had an FZ30 as my main camera a few cameras back. It was decent but I moved on to DSLRs since then. I wouldn't replace my DSLR with the FZ300 but, if I had the extra cash, it might be a great addition to my collection of cameras.