According to PF, a new Pentax APS-C DSLR camera will be announced in early 2019, around CP+ Show in February. This new Pentax APS-C camera will not replace current Pentax K-3 series, instead, it will be a new model, and to have some more features from Pentax K-1 series. Stay tuned.
From PentaxForum:
“There will be a new APS-C camera. No K-3 replacement. A new one! Will come for 100th Pentax birthday, next year. Announcement or sale (no more information): February 2019. The new camera will have some more features from K-1. That’s all the news I got from Pentax at a roadshow. This sounds like the interview from Mr. Baus, Pentax Europe. So I think it will come. I forgot: He said that there will be some more “gifts” for Pentax users next year.”