Hangar 13 has indicated that its current project is now in the pre-production stage.
The studio has recently published a job ad for a Tools Engineer and its description reveals that this specialist will work on a multi-platform Unreal Engine 5-powered game that is currently in pre-production.
While the job description doesn't explicitly mention the title of the game, it's likely that it refers to a new installment in the Mafia series.
This lines up with the developer's confirmation last August that it was indeed working on a new Mafia game. At the time of the announcement, Hangar 13 noted that the game was in the very early stages and that it would take several years of development before any additional details can be disclosed.