^ I'm in the same boat as you. I have 2 K-50 bodies & 4 lenses, but I'm waiting to see what Pentax does with their upcoming APS-C flagship. I'm hoping for improved AF performance in all respects, especially in low light tracking, improved IBIS, & improved IQ. My biggest want is improved AF. It has to meet or beat the Nikon D7200's AF performance in all respects 'cause if it doesn't, I won't be getting one. This is also the reason why I've been holding off on purchasing any other Pentax lenses for now. I'd really like to stay with Pentax, but it all depends on the AF performance of the upcoming flagship.
I'm not an early adopter for the most part, but I might be an early adopter for that camera if Pentax delivers the goods in it. I'll get it around December of this year. That's if it is actually released this year, online reviews are good, & early adopter reviews are good. My guess is that the body will go for +-$1,300.
The K-3II is still a good buy, but chances are that it will start to drop its price tag if that other flagship comes out. Last year, the price on the K-3II body sunk as low as $727 on Amazon near the end of February. That was the lowest that I've even seen.
Pentax K-3 II DSLR Camera Body W/AF-200FG Shoe Mount Flash/D-BG5 Battery Grip
^ Adorama is currently selling the K-3II with a grip & flash for $900. Keep looking at the price watch forum & chances are that you'll be able to score a smoking deal on the K-3II later on.