The Panopticon/Terra Incognita — spoiler or cancelled story?

Terra Incognita was the name of a Big Finish Bernice Summerfield series book by Ben Aaronovitch, part of Big Finish's "Young Benny" sequence. There was an extract from the book in Missing Adventures, in 2007. The most recent update was in April 2009, when Aaronovitch said "I'm hoping to have the book finished by the end of October 2009 or April 2011 at the very latest." Nothing's been heard of it since, and Big Finish no longer publishes Bernice Summerfield books.

What status should it be given? Should it technically be considered a future story, and therefore a spoiler? Should it be treated as an unproduced story, like The Laird of McCrimmon? Is the chapter published in Missing Adventures a valid short story, or "one long deleted scene"?