In defense of Theory Spark, I think they may have been blindsided by the calling of an early election by the Australian PM. That simply did not leave them enough time for them to create the first PM game on the new game engine. It sort of stinks that the game will be released after the election, but better it be right and late than sloppy and early.
I frankly was surprised that the Australian PM called an early election, thinking it would have made more sense for her to establish her credentials on the job and then drop the writ when it likely would have been dropped anyway, in October. I think she's taking a real gamble, but it looks like it might pay off.