I'll just note that Christine Thompson is 'Kestrel', the game's head writer. I don't read STM any more, so I didn't see that.
As for Greg's news - I don't follow the authors on Facebook, so will have missed that. A link would be appreciated.
Of course, he doesn't say it's a book - could be a comic or videogame, or fan film - but on the balance of probabilities...