I have just been reading the discussion group on Flickr Flickr: Fuji Digital Camera Users X10/discuss/72157629252110028/ and it raises the point that other makes some much dearer than the X10 also have a 'orb' problem. It is I think worth reading this contribution to those who like me are hesitant about buying the X10.
They gave me the "late May" time frame again and I put my name and e-mail down this time.
Also, sensors will be replaced for ANY X10 owner, regardless of warranty status. That means that X10s without original invoices/receipts will be serviced for free (I asked about this thoroughly). Great news!