If they really did have the other 2 PTs completely finished, then there might be a 3D BD release at some point, the cost of mastering and distribution isn't all that high, and it would recoup some of the costs.
I'd be surprised if they were completely finished though, usually you use the money from the first project to fund the next one.
You should give PFDepth a try, there is a two week free trial, you can knock over a lot of frames in two weeks :)