I have a Unity Pro license, and as written in the deployment section of this page -
I would like to remove the Unity Splash Screen. I already know how to replace it with my own image. I am, however, looking forward to removing it completely. I tried replacing it with a blank image, and it shows a blank screen for about 5 seconds. And if I leave the splash screen section empty, it shows Powered By Unity logo.
For future reference, (to the devs that are looking for a solution).
Note that the loading screen is there to preload your scripts and objects before entering the game.
There is no way as completely removing the splashscreen as it is needed to preload your components, as far I understand it.