First, don't worry about PS4K until we actually get to know if it even really exists and what it is, just get the PS4 when you wish if that's what you are planning to do.

About games, seems like you'll focus more on exclusives s you said you would rather play multiplats on PC, so things like The Witcher and Metal Gear Solid are out of the scope, right?

Then for first party games you should go with Bloodborne and inFAMOUS: Second Son.
I should also recommend you Disgaea 5, so if you know nothing about it, go give it a check before getting this one, it's easy to not get into it as it has a very specific target public, so it can or not be good for you, personally I absolutely love Disgaea games.