Ricoh just updated its full-frame camera information. Of particular interest is the phrase, “ ” under one of the new images (from the D-FA 24-70mm lens). I understand this to mean that the camera itself will provide the AstroTracer, so that no O-GPS1 accessory is needed. Note, however, that one reviewer of the K-3 II has commented that the inbuilt AstroTracer function in that camera was not as reliable as using the O-GPS1 on the K-3. Hopefully, Ricoh will have made improvements in this area.
Pentax full-frame with AstroTracer built in