In an interview with 4Gamer.net as found by Gematsu, Miyazaki explained the 3.5 product lines he mentioned in a separate interview in June 2016. At the time, he mentioned the studio’s 3.5 product lines, which can be broken down like this:

0.5 – Déraciné1.0 – Sekiro: Shadows Die Twice2.0 – Unannounced Titles

For those who don’t know what the games are about,Déraciné is a PayStation VR title that tells the story of a fairy that lives with six children in a secluded boarding school. While Sekiro: Shadows Die Twice is a game set in feudal Japan, with a difficulty that’s definitely befitting the studio that made Dark Souls and Bloodborne. When asked for clarification, Miyazaki said that there are indeed two more games. “We’ll need a little more time, but we’ll be able to tell everyone more about them once they take shape,” he said. (Source: 4Gamer.net via Gematsu)

From Software Has Two More Game Titles In The Pipelines - 42