Here is a short tutorial showing you how to change the FOV in The Darkness 2.
Just follow the instructions below and you should be gaming at your desired FOV in no time.
1. Download Widescreen Fixer @ http://www.widescreenfixer.org/
2. Open the app and select The Darkness II profile.
3. Click the cog and enable Aspect Ratio Fix and Field Of View Fix.
4. Now select your FOV, I chose 62. You can select higher if you wish.
5. Save your settings.
6. Now click the settings tab and setup a hotkey. This will be used to change the FOV in-game.
7. All you have to do now is start the game and hit the hotkey you setup and your FOV should change.
Here are the settings I used