If you have a PS4 and this demo, you need to disconnect it from online immediately.
Thank you for your comments, guys. I've updated the article to point out you attest you did not encounter the same problems this PS4 user did. When we get more information about what happened, I may either update this article again or write a new one. Feel free to PM me if Sony, Konami, or Twitter user pacifist_elk shares new info, thanks!