So, what are we guessing the R3XXX product stack will look like?
R7 - 12 cores (2x 6)
R5 - 8 cores (1x 8)
R3 - 6 cores (1x 6)
Athlon - 4 cores (1x 4)
I think that we'll probably only get ~3 different models in each of those ranges, mostly because AMD doesn't lock down their chips. We'll see a regular part that you can still OC, a top-end part that has higher guaranteed clocks, and likely a low power part that has slightly lower clocks, but falls into a lower TDP bucket. The low-TDP part will definitely exist for the R7 and R9. We might see some additional parts that occupy a particular niche like an R5 binned for absolute maximum clocks sold as an extreme gaming part.
For ThreadRipper, I don't think they release anything with fewer than 24 cores. There will probably be ThreadRipper parts that only contain 4 active chiplets, rather than using 8 chiplets that have a large amount of disabled cores.
I'm also rather skeptical about whether they'll release any parts containing chiplets with only active cores. Assuming that they do that at all, those would most likely wind up in a specialty server chip designed for high clock speeds, but low core count because there is a market niche for those there.