Unfortunately, I would not at all be surprised to find out if the remainder of the series had been discontinued on the heels of the incest allegations. As far as bad press goes, that is pretty much about as bad as it gets...
On the off chance that I am wrong, my guess is that the company is probably waiting a little while longer before putting out the next title in the hopes that the story will have faded from public memory by then.
I feel like such a cynic for even going there but I do struggle to come up with any other reason why the huge time lapse since the last release...
Cheers and Happy New Year my old and new board friends,
Eran