No idea. Last we heard Julian was producing a chess game for Ubisoft, but no news since then.
The 600 000 figure is a lot more than Dave Ellis suggested. I think that would be a good figure even today, provided the budget was not too high. I fired off an e-mail to Edge seeking confirmation of the figure, because it wasn't a direct quote from Julian.
Also, why are we the only ones not to get a response from him?