Samsung plans to renew the model Z1, the one operating on system Tizen. Samsung Z1 is the next to model Z3 as most famous equipment from manufacturer with this system. Z1 (2016) will probably be a same device only slightly improved.
Korean manufacturer is know from renewing low- and medium-budget models slightly modifying their specifications. However, available information on the Z1 (2016) contains the promise of AMOLED screen like in the Samsung Z3. First Z1 has a display PLS. It is unfortunately the only information about its specifications.
Samsung Z1 (2016) will probably be a cheap smartphone, like the rest of the models operating under the control of the Tizen OS. Details related to technical specifications will be announced in some time.