Catherine demo is now available on Xbox Live Marketplace and PlayStation Network, as expected.
The demo weighs at 854.20 MB, while the description states, "Explore the pleasures and horrors of love and the choices we make for it in this action-adventure/puzzle game unlike any other. As Vincent, you have a hard choice to make: marry your longtime girlfriend Katherine or move on to the incredible blonde you just woke up next to--named Catherine! But beware! Make the wrong choice, and you could end up dead."
The game was a smash hit in Japan, though complaints about its super-high difficulty there led Atlus release a patch to make it easier.