Admittedly, there's not much in this story right now, but according to Atlus' Persona 5 live broadcast, the game will be at E3 2016 in some capacity. Whether this means it'll show up at Sony's press conference or not, we'll just have to wait and see.
If you haven't already seen the news, the role-playing title finally has a Japanese release date. Could it be that it's showing up at E3 to confirm a Western launch date? it's certainly possible. Could it still release overseas this year? Also possible, we suppose. In any case, E3 is only just over a month away, so we'll know for sure soon enough.