There are some topics about the code behind the loading screen:
Where is the file: [url]How to customize loading scene? - #4 by Lizard-13]
Modified examples: [url]Some improvements: Virtual keyboard on mobiles & preloader - #4 by ricardograca]
Example of a custom loading screen: [url]Custom Screen Loading (HTML5) - #3 by Freetalent]
Basically you have to comment (//) the line where the text object is added to the pixi container (loadingScreen.addChild(text) or something like that) 