The beta version of Super Mario Sunshine. When its trailer was first shown at Space world 2001, Showed images that is not even close to what we now know as super mario sunshine.
From what we see in the video. Much of the levels look had a more realistic look to them. It also shows that coins were going to have suns instead of the coins normal look.
Enemies appeared to be giant walking beats. Unlike the little globs of paint in the finished version.
There also appears to be... Humans?