Earlier in the week, Undertale creator Toby Fox released chapter 1 of Deltarune, much to the delight of the original game's fans. It's a lengthy slice of the new game, providing several hours to get acquainted with new characters, a new story, and an updated battle system. Of course, it's led to a lot of questions -- when will the full game be out? What platforms will it be coming to? Is it a direct sequel to Undertale?
Fox has answered most of these kind of questions in an FAQ, but unfortunately, most of the answers are vague. In short, it sounds like we won't be playing Deltarune any time soon.
He says that chapter 1, which he made alone, took him several years to make, where a similar demo of Undertale took him mere months. He puts this down to the more advanced visuals, multiple main characters, and the more involved battle system. In terms of timescale, Fox doesn't want to spend any longer than seven years on the project, and says it'd be "impossible" to make this game alone. He'll be hiring a team to help him complete it, but due to a lack of experience in managing a group of people and various other factors, it'll still take time for the game to be released. In other words, expect to see it emerge in a few years.
On a more positive note, Fox says that the story and some of the music is ready -- he now needs to get started on programming and finalising art work. He also doesn't like to describe Deltarune as a sequel to Undertale: "I will say that basically, what you're seeing here is not the world of UNDERTALE [...] DELTARUNE's world is a different one. With different characters, that have lived different lives. A whole new story will happen..."
The first chapter is a tantalising glimpse at the next game from Toby Fox, but it could be all we get for a long while. As for PS4 (PS5?) support, we're still no clearer, so best to assume not for now.