UPDATE (Apr-17-2011 8:34pm EST): There is a long discussion on this in the dpreview Fuji Talk forum!
It looks like the warning at the Amazon page may not show with Firefox 4, but it is there when visiting the page with Chrome, Opera, Safari, and Internet Exploder 9. A couple of other parts of Amazon's site seems to have issues with Firefox 4 as well (eg lightning boxes in product sub-categories).
Needless to say, it is a good idea not to buy the camera now until things get sorted out!
As of a 6:53pm EST check, we noticed that Amazon has inserted an "Item under Review" warning on its Fuji HS20 product page, and Amazon itself temporarily does not offer the camera for sale (but 3rd-party sellers continue to do). It says:
"While this item is available from other marketplace sellers on this page, it is not currently offered by Amazon.com because customers have told us there may be something wrong with our inventory of the item, the way we are shipping it, or the way it's described here. (Thanks for the tip!)
We're working to fix the problem as quickly as possible."
We have no idea what the issue might be but we have seen this type of a warning for other cameras in the past.
While the message says it is not offered by Amazon itself, if you look at the "More Buying Choices" on the right sidebar of the page, Amazon is indeed listed as one of the sellers. It is probably a good idea not to buy this until they get it sorted out!
We have the first sizable discount on the superzoom Fuji HS20! You can now get it for $455~ with free shipping, sold and shipped by Amazon itself.