I think the Owners' Club is a Europe-only deal; I suspect each region's distributor put together its own package of owner incentives.
In the US, sending in your registration got you a copy of Adobe Photoshop Elements and a Tamrac camera bag. (There were some complaints at first about the suitability of this bag to the R-D 1, but I just took a trip with mine and it worked great for holding the R-D 1 body, a Bessa R3a body, about five lenses, a P2000, various chargers and cables, and a few rolls of film for the Bessa. Perfect fit.)
I think everyone gets the certificate of authenticity, regardless of where you bought it. This, of course, helps protect us from buying counterfeit R-D 1s (made from Fed bodies, perhaps?) : )