Source: e-Sertifikasi Portal (in Indonesia) via Nokishita @Twitter (in Japanese)
The models R02020, R03030 and R05010 are new, which should be under development. Whether they are in the Ricoh or Pentax brand is yet unknown, though. Furthermore, I list below the recent registered R-numbered camera models by Ricoh for your better wild guessing. ;-p
R01010: Pentax K-1 Mark II
R02010: Ricoh GR III
R03010: Pentax K-3 Mark IIIkey