Bringing out a camera to compete with the D3 or MarkIII would be a very dumb move from Pentax right now.
They need to make profit, quick. And you don't do that with a 5000$ product that only a very small portion of the market needs. You do it with a competitive product that appeals to the large public of consumers, and is affordable enough for the average Joe to buy.
So coming out with a model that competes with the D300/40D and one that takes on the D40x/400D is definitely the best move.
But it's all rumors anyway...
Tom