Just in case the similarities between Mafia 3 and GTA 5 weren't confusing enough already, the newest trailer for the former prominently features a bank heist. Now, we've talked about how the close resemblance could but won't hurt Grand Theft Auto Online in terms of stealing players, but this new trailer just makes it look like 2K is poking Rockstar Games just for the hell of it.

Now, we might be looking at some sort of rivalry going on between the two developers under the 2K umbrella here. We mentioned how it is likely that Mafia 3 will be a single-player only experience probably because the suits at Take-Two Interactive didn't want their successful work-horse GTA Online to bleed players. It is likely that the 2K team working on M3 did intend to create some kind of Online mode, but were forbidden from doing so.
Obviously, they should now that Rockstar's dev team didn't handle that decision, but even so, this newest trailer focusing on the protagonist boosting sacks of cash from a bank could be some kind of retaliation.