I saw mention of that on the page and have been curious what a "deadly" version of the game could include.
The current build has 9 different endings, and gives you a taste of what the game is all about. The Deadly Edition is the full version which will include at least 19 different ending, but most importantly it will add a main story-line to follow.
Details will slowly be revealed as development progresses, but rest assured it is going to clarify what the true meaning of this game is. (it's a game-changer)