The German company meyer Gorlitz announced the launch of a third lens for 2017. The hint comes via their current Kickstarter campagn for the 50mm Trioplan lens:
Restoring the Trioplan lens line means that all good things come in threes. Our major 2017 lens announcement will be the third and final Trioplan in our line-up.
The lens will be available in different mounts including Sony E, MFT, Fuji X and Canon EOS-M.