Atlus held a Japanese Niconico live stream during E3, where they had a live gameplay demo, and showed videos of the new party member and cooperation characters. While most of the presentation is in Japanese, some parts are also in English, as they interviewed the fans present at E3 2016. You can take a look at the video below!
『ペルソナ5』E3ニコ生特番【怪盗団を暴け!】アーカイブ映像