Ricoh is rumored to be working on two new Pentax lenses:
The HD Pentax-DA★ 50-135mm f/2.8 ED PLM AW will be a replacement for the current smc Pentax-DA★ 50-135mm f/2.8 ED (IF) SDM, which is now 15 years old – just like the HD Pentax-DA★ 16-50mm f/2.8 ED PLM AW replaced its predecessor the smc Pentax-DA★ 16-50mm f/2.8 ED AL (IF) SDM.
I was also told that the development of the new HD Pentax-D FA 70-300mm f/4.5-5.6 ED PLM WR SR lens has begun quite a while ago but was delayed by difficulties in making the sensor stabilization and optical stabilization work together.
Stay tuned for more details.
