I hope it's Mafia 4, and I'm quite sad about how badly Mafia 3 is seen, although it's deserved, but that sucks.
Mafia 3 could have been an AMAZING game, it was really close to be something truly great. The story, the characters, the atmosphere, the core gameplay, all of that is really great in Mafia 3. It's however completely RUINED by all these terrible, terrible filler quests that are mandatory to progress through the main quest. The game becomes extremely tedious and repetitive because of that, hurting what could have been something really good.
I swear they should make a new edition of Mafia 3 that's like the opposite of a director / extended cut. Like, Mafia 3 "Essential Cut". Remove all the filler side missions / gauges to fill, just limit it to the core story and get rid of all that ubisoft style world content. And boom, you have something 10 times better, while just having to remove stuff.
The game will be shorter yes, but I'd take a great 12 hours Mafia 3 rather than a 30 hours boring Mafia 3.
I still think about it every now and then because I truly enjoyed its characters, lore, world.