So, why did Telltale make the first two chapters of Jeff Smith's Bone but never continued then? Here's a possible explanation: the movie is well under way. The producer of the new Sherlock Holmes movie, Dan Lin, was talking to Collider about his future projects - of which Bone is one, well into production at Happy Feet creators Animalogic.
It's a (CGI presumably) animated movie, Jeff Smith is closely involved, they're meeting with directors now and hope to have one announced in January, and it (HOORAY!) won't be one movie. So, bought the books yet?
(Tingler's Side Note: although excited frankly I'm terrified about Lin and Animalogic's other project, a Tom & Jerry origin movie, which sounds like a terrible idea. Oh well, let's hope for good things)
Source: Collider
I feel that the overall dramatic weight of their duality was always undermined by things like Tom surviving a salami-slicer or being bludgeoned with a monkey wrench.