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An update from the developers at Hangar 13 paint a bit of a sad picture for the PC release of Mafia III on the eve of its launch. The team says that the game is currently locked to 30FPS due to parity with the console versions. Ah parity, we meet again.
We know how important having options that best suit your PC’s performance capabilities are. The team has been hard at work ensuring that Mafia III’s performance is consistent across all platforms, and right now the game runs at a solid 30 frames-per-second. We are currently working on an update for PC that will give players the option to play Mafia III at higher framerates. We’ll share more details about the update, and when you can expect it to arrive, very soon. In the meantime, the team welcomes feedback and would like to hear from you about what performance adjustment options are important to you. We’re actively considering a number of additional post-launch improvements on PC that would give players more control over how they can tailor the game’s experience to suit their rig’s performance. It’s been an incredible journey developing Mafia III and we couldn’t be more excited to get the game in your hands and hear what you think!

So yes, while the game will launch with a 30FPS lock, it sounds like the team is working on an update that will allow for higher framerates. Why this was not included prior to release is really anybody's guess.