Look what Rincón del Simmer found!
Toby Marvin was an interface designer of The Sims 3 when it was in development, and has published in his profile on Coroflot two images belonging to a loading screen ruled out as a preliminary version of the game launcher (it seems that The Sims 3 was in the version 0.0.0.6174.
This is a concept I came up to the loading screen of The Sims 3. The concept was that the clouds fall from the top and bounced to a stop (as do the menus of the interface) as the progress bar fills up. The clouds are dynamic so it’s never the same twice. The “Globe pig” is one of many flying objects in the game and sometimes one of them float on the loading screen to mix. This was not put in the final game, as it was considered a low priority compared to many other tasks.