Minecraft is very quickly becoming Telltale's most consistent series in terms of releases.
The fourth episode, “A Block and a Hard Place,” will be showing up sometime this month, though a specific date has yet to be revealed. Interestingly, Telltale says that the episode out this month will wrap up one story that's going on in the series.
The final episode, which appears to be called "Order Up!" will be releasing sometime early 2016.