I like to watch the "Numb3rs" TV show, so I can't resist trying to detect patterns from this kind of info.
For example...
We still haven't gathered enough data to infer whether the serial numbers are a simple sequence, or numbered in batches, possibly by market area.
If you like the market-area hypothesis, so far it looks as if Asia could be block 000xxx, the USA could be block 001xxx, and Europe block 002xxx.
(This grouping could just be a coincidence based on the release date of the camera in various markets... except didn't the UK and Europe have their official rollout earlier than the US? If so, you'd think that the European cameras would be mostly 001s and the US cameras mostly 002s, rather than vice-versa.)
Meanwhile... If the serials are numbered in blocks, then how do they increment once a 999-unit block has been filled out? Does the first group to exhaust its block get the next available block, or is there some sort of system to this as well?
We have one report of a UK-purchased camera in the 003xxx block. (Epson apparently has been using our own pfogle as a sort of human mine-shaft canary for defective R-D 1s, so it's not surprising that Europe would exhaust its serial-number block first.)
Where will the next 003xxx camera appear? This could be the next clue in our evolving Epson Number Theory...