About Persona 5, I think I know when exactly it will be released in Japan.
I've noticed with ATLUS games that there is always a four month promotion period for each game following its release date announcement, with the exception being PQ. Each game uses a literal four month period, by rounding it up to the first of each fourth month from the announcement of the release date. Here's an example of the pattern:
Devil Survivor 2: Break Record - Release date announced in September 2014, released in January 2015. Four months.
Etrian Mystery Dungeon - Release date announced November 2014, releasing March 2015. Four months.
Persona 4: Dancing All Night - Release date announced February 2015, releasing June 2015. Four months.
Persona 4 Arena Ultimax - Release date announced April 2014, released in August 2014. Four months.
So, we know we're getting a new trailer for Persona 5 in June, as it's the pre-order bonus for P4D. My bet is that the release date will be shown on this Blu-ray disc. But, since not everyone will be getting P4D, ATLUS is probably going to announce the release date another way, too. However, that isn't the important thing. We know P5 is getting a special trailer in June for all that pre-ordered P4D.
If we go by this theory, you will be seeing Persona 5 on Thursday, October 15, 2015 in Japan. That's my bet. Four months from release date announcement, if the release date is announced in June. The 15th would make sense as it has a 5 in the date, so I doubt they wouldn't take advantage of that.