Mafia: The Old Country is the fifth title in the series (or fourth, if not counting Mafia Classic and its remake Mafia: Definitive Edition as separate entries), and is due for release on 8th of August 2025.
At the time of writing, Mafia: The Old Country is set to launch with Denuvo with an "Internet connection required to redeem bonus content". It's worth noting that Mafia: Definitive Edition also launched with Denuvo, which was later removed.
All previous entries in the Mafia series have come to GOG DRM-free, so there's hope that the same will be true of this one, as well.