4 K´s in a row

Two more models above the current K5 which is already a very fine camera?

What will make the new higher camera end worth upgrading over the K5 replacement, or why would one buy it say over a budget priced d600. I just cant see how Pentax could justify the cost of a "pro" crop camera compared to the competition. What would make this camera special? There doesn't seem to be anything Pentax can do to one up Canikon in aps-c format.