Bump with screenshots.
After finding a newspaper in the bathroom, Wario learns that pyramids have been discovered, rumored to have lots of treasure (obvious from the picture), and of course runs off chasing treasure.
Keeping with the crude humor present in most Wario games, bathrooms act as save points! Complete with flushing noises! (Also, for more out of the way areas, there are outhouses.
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And as usual, Wario goes around doing whatever he pleases, not caring about the consequences.
Waluigi will appear after the first pyramid is cleared. Oh, and I'm not done yet, so, sorry, no demo.