Destructoid: I wrote up a full Catherine preview earlier this year after playing a good deal of the Japanese version. There's no point in doing that all again, right? If you did miss my preview, here's the bulletpoints from it:
Catherine is not a sex game, but a puzzle game
Catherine is a difficult game
Catherine has a great story
Catherine is beautiful and is a showcase for Atlus
games in HD
So now that we have this covered, here's an update on the upcoming English version.