The next Pentax K-3 III DSLR camera is rumored to use Sony’s 26MP APS-C Sensor. This is the one that Fuji uses the customized version on Sony 26MP X-Trans Sensor on their Fuji X-T3 and Fuji X-T30 cameras.
The second version Pentax K-3 Mark II is already discontinued and latest rumors indicates that the company will unveil the Pentax K-3 III DSLR camera in 2020.
Probably we will see some major improvements in the core specification of the upcoming Pentax camera in 2019. On the other hand expect from Pentax to introduce 4K video recording to their APS-C DSLR line-up in 2019.