Early build leads to many new findings!
Modders stumbled onto some unexpected surprises when modding the vanilla version of Marvel vs. Capcom 3 for the Xbox 360. This version of the game contained quite a few assets that were either never used or were initially cut only to be added in the UMvC3, as was the case with Frank West.
Doc Ock was another interesting find. Apparently, the classic Spider-Man villain was supposed to be in the game from the start, but had to be scrapped during the complications caused by the earthquake that happened during the development of the game.
In terms of stages, it seems like no actual 3D assets were uncovered, but we have an image of what could be Chun-Li's stage, set near The Great Wall, and showing her statue in the background.
Some of the other things are not as dramatic, some art here, or a voice line there, but perhaps there's more to see in the future!