Given the make-up of the West this season, and improvements made across various Western Conference rosters, as well as notable recoveries from injury on a couple of key teams, I'd say the Kings could reasonably be considered an 8th or 7th seed this season based on their talent, their coaching staff overhaul, and their performance in the preseason.
I don't think the play-in is a high enough bar, and I think it would be disappointing if they weren't at least a lower-seed playoff entrant heading into the post-season. The Kings have starter-level talent all over their roster now, and the importance of that cannot be overstated. They have length all over the roster. They have passing and shooting all over the roster. The defense remains a question mark, but the preseason returns are certainly encouraging.
I have been mightily impressed with Mike Brown since he arrived. I didn't give Monte much credit for that hire initially, believing Brown to be a safe and uninspiring choice. But it could be that he's exactly what this team needs, and if the roster buys in to Brown's messaging and truly holds itself accountable to the upper limits of it's ability, then I think the Kings are quite definitively a playoff team this season.