Most of us have known that GB3 was really an impossibility since 2000. But your news is half right. Dan Aykroyd does have a finished script to GB3, and all he has to do is get the money. Remember, the original GB cost of making the picture Dan wanted it to be was around $600,000,0000. It never came out that way. With GB3 it is supposed to be around that margin with more. Sony, apparently, does not want to risk a billion dollars on a franchise that only fans will see.
If your source is credible, why not post the site where it comes from, hmmm?