There is a link at dpreview.com in the Fuji Talk Forum directing users to a photography site that has released some pre-production sample images that they took. Not a lot of details as yet but interesting none the less.
The quality of the images is neither better or worse than the HS10 so trying to form an opinion from such a small set of samples is not really possible.
Follow the link and make your own conclusion as to whether there is anything that is standout to you. For me at this point I have seen nothing as yet to make me mortgage the house for the newer cousin of the HS10.
Polish HS20 preview & samples
Note for those who dont speak polish the translation seems to work ok.