Press conferences are definitely very different than "not showing up at E3." Atlus had about a million P4D demos across different media outlets at E3 2015. They've done the same in the past with their other games, too. Their games are on the E3 badge. They definitely "show up" in a big way.
Now for conferences? New Persona 5 media has definitely been Japan first until now, and I don't know if that will change. An E3 press conference segment devoted to P5? Seems unlikely.
I'm not talking about other Atlus titles tho, I'm just talking about P5. Yeah, DAN had a good showing last year (it was even in the Sony's conference) but P5 was embarrassing and that's what I'm talking about. So people really shouldn't set their expectations high in regards to P5, cause when it comes to that title, Atlus doesn't care about anywhere else but Japan.
So, while they definitely do show up to E3, them showing up usually means nothing if you are looking forward to P5. Just look at the way they handled PV#2 last year or the fact that we still haven't seen the official English version of PV#3.
I'm just gonna repeat myself one more time. When it comes to P5, rest of the world don't exist to Atlus. All that matters to them is Japan.
