Pentax K-3 III camera ir rumored to be announced in 2020. In an interview in 2018, Ricoh already confirmed that a Pentax K-3 replacement is coming.
The second verison 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.