Smash bros infinite secret blurred mode is "spirits"?

something that can support this theory is the new castlevania trailer where Luigi lost his soul

what could this mode be?

I am not convinced that it actually is "Spirits." With Photoshop it's very easy to fake an image like this. Anyone with basic Photoshop knowledge could doctor an image like this in under 5 minutes. I'll hold any speculation and wait until we get an official announcement from Nintendo.