So no R7 2800X. The R7 2700X is the new flagship, boosting to 4.35 GHz. The market space for a potential R7 2800X was probably not there, considering they still have a significantly lower clockspeed ceiling than Intel and have to compete at different price points to last time (Ryzen 1 flagship = $500, Ryzen 2 flagship = $370). Unless of course they can scrape enough higher binned chips and release it later, as sideways14a said.A leak of AMD's presentation slides are out: https://videocardz.com/75194/amd-ryzen-2000-series-exposed-pricing-performance-leaked
It also looks like they're not bothering with an R5 2400X or any R3s without IGPs, at least for now. They might come later but with the "G" series chips they might just feel there's no point making their line-up bloated and confusing. Interestingly, this leaves their current line-up with only one non-SMT CPU: the R3 2200G.
The R5 2600X looks tasty with 4.25 GHz turbo, and the R5 2600 makes the i5-8400 a complete waste of time ($20 more but overclockable and with SMT). Got my eye on the ~£260 R7 2700 if DDR4 prices ever fall...