New Loading/Splash Screen

Hello, the system splash screen behavior was recently updated. 

In the past the image supplied by the App would be shown centered on black with the three loading dots below and the size of the logo was pixel perfect so changing the resolution would change the display size.

As described here: https://developers.meta.com/

Now after the recent update, the system shows this new fancy animated light rays thing and the image is scaled to fill the entire screen width, i think.. It's very large now and as a result it's very blurry. 

I was wondering if there is any updated documentation with newer recommendations on what resolution to use now or how the behaviour has changed.

I want to avoid submission problems by just guessing, thanks everyone