Jake embarrassingly forgot to tell us, but Campo Santo is, indeed, developing a new game. There's even a trailer.
Looks Firewatch-y. What's In the Valley of Gods all about, outside of what the trailer reveals? Who knows, but feel free to read the FAQ, full of questions nobody frequently would ask. 2019 seems to be the release year, so no need holding your breath.
(Zaarin -- reminder to add a Campo Santo category.)