Here is a report about the GR meet event. It looks like around 100 people attended.
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You can dismiss what forum posters say about GR continuation if you like, because they might be misinformed or just making it up. You can also dismiss what Ricoh staff say, because they might be saying things just to keep sales going (but I think they also have a reason to underpromise to keep sales of current models going). What is more difficult to dismiss is the actions Ricoh have taken recently to draw attention to the GR. They have redesigned the online store, restarted the blog and started SNS accounts, held an event, featured the GR at CP+ in a rather mysterious way, and included the GR in the logo of their redesigned stores. They have no reason to do this if they are just going to let it die.
I’m not sure why there is so much concern about it being “late”. The camera has no clear competitors on the market. Two other major competitors tried to muscle in (Nikon A, Fuji X70) but failed because the GR was simply better. In fact, the main competitor to a hypothetical GR III is the the GR II. Ricoh are in no hurry, and are most likely aware that a modest update (swap out the sensor for a 24mp one) will not be enough to make users upgrade. So I think there will be significant changes to the GR when it comes. What makes it more complicated is that a major change to the sensor or optics would require a redesign of many accessories too. In a way, GR is like a mini system of viewfinders, adapters, converter lenses and other items - not so easy to manage inventories and replace all at once.
The GR II is consistently placed around 20-30th on the Kakaku.com sales ranking in Japan. It seems to be a modest but consistent seller. Availability went down to just 30 online stores a couple of months ago, but now it is in stock at about 50 again. I read similar comments about it being in and out of stock in other countries. That makes me think it is selling well enough to justify another production run. It also makes me think a replacement is at least a couple of months away, but basically inevitable.