That was one of the criteria that Eli posted in the article about this TA deal. They won't highlight games that are going free because an update looms that will change the game to freemium. This won't be a super regular thing either but rather something special that happens on an irregular basis. I've been wanting 9MM for a while. I'd also like to see The Last Express, Lunar SSS, or something older like Asphalt 5. I'm not sure how well they reviewed on TA.
I bought this game a long while ago. I can't believe this game is going free. It is a really good game (pocket Elder Scrolls). Going free just cheapens the brand IMO.