"Back in October I mentioned that we started working on a new standalone Underrail campaign. This is still true, but we've also decided that we're going to give the engine a major upgrade which will help us create a much better game, both visually and mechanically. The thing is - there are certain design and technical decisions that were made early during the development of Underrail that are very limiting to us now, but are not easy to change just due to the amount of content that would have to be redone. So instead of taking a hammer to our beloved game, we're going to improve upon all these things (that we yearned to do for years) in a fresh stand-alone game that will still be based on the same engine core and gameplay mechanics. We call this game Underrail: Infusion."
