People will soon have a way to see how the Catherine Switch port plays. The Catherine: Full Body demo, which was announced back at the end of May 2020, has been dated. The official Twitter account confirmed that people in Japan (or with Japanese eShop accounts) will be able to test it out on June 11, 2020. [Thanks, Gematsu!]
It seems as though there may be a chance the Catherine Switch demo could be similar the one released for the PlayStation 4. In the announcement, it said that this demo would look at two days from the full game. In the other Catherine: Full Body demo, the focus was on a tower tutorial, meeting Rin, and looking at some of the events from the first day and second days. That trial was about 40 minutes long.
Catherine: Full Body will make its Nintendo Switch debut on July 2, 2020 in Japan and July 7, 2020 worldwide. It is immediately available on the PlayStation 4 worldwide and on the PlayStation Vita in Japan. The Catherine Switch demo is only confirmed for Japan at the moment. However, Atlus did already confirm that the three new voices for Catherine would be present in the game in every region.