While gazing deeply into my crystal ball, I'll add my murky view to this topic:
I think that Amazon will wait to offer the Kindle worldwide roll out until some of the obvious unit bugs are worked out. The Kindle's production and distribution as well as the unit's design, and software still need some fine tuning. I'm guessing (sorry the crystal ball went blank here) that Amazon may even wait until the second generation of Kindles appears to start marketing to the rest of the world.