For some reason these two things are sticking in my head.
1) Fixed Lens Full Frame Rangefinder - which would be the big brother to the x100 series. Would an x200 series have it's own subforum or be merged with the x100 series? If this was to come true then I think it would warrant it's own forum.
2) Medium Format Rangefinder - The digital successor to the GW-690! This one is way more of a long shot in my mind. We don't have any lenses that would work on a MF sensor (as far as I know). Again we haven't really seen anything about new lenses geared towards a sensor this size or appropriate lenses.