If any of the details released today - both factual and speculative - is any indication, the original Mafia is set to receive a proper remake as part of a greater remastered Mafia Trilogy, which is apparently coming out in August. The unfortunate part of this news is that only part of it is technically official, with the rest being gleamed from a pre-mature store listing that may or may not be related. You see, the internet in 2020 is a chaotic vortex of guerrilla marketing masquerading as "leaked" information, and it's often difficult determine when it's just that, or if someone accidentally left clicked when they meant to right click.
In any case, what we know at this point is that the Mafia games are being re-released as a trilogy, and based on a teaser trailer published on the game's Twitter, at least one of the titles - specifically Mafia II - looks as though it has received a bit of a visual update since its original 2010 release.
There's also talk of a Mafia: Definitive Edition, which, according to a Microsoft Store listing that has since been removed, is a complete remake of the original Mafia game with updated graphics, gameplay, and music. So far, the popular consensus is that Mafia: Definitive Edition will be included in the aforementioned trilogy bundle, but who can say for sure. Oh yea, 2K.
As it just so happens, the studio has announced in its teaser trailer that another announcement is coming May 19th, which in all likelihood will address any and all questions pertaining to the upcoming Mafia Trilogy, so all we really have to do at this point is wait and see what happens.