Atlus have released further information regarding the release of Persona 5 in their recent live stream. The main information (along with some pretty great stuff from the OST, and an more extended look at the gameplay) is the release details (presumably for Japan only at this time). According to figures shown on the niconico player, approximately 220,000 people were watching live towards the end of the broadcast.

I believe the next P5 related event / information will be at E3. Persona 5 will be available for pre-order starting 2016-May-06.

Persona 5 for PS3/PS4 - Releases 2016-September-15 for 8,800 yen.

Persona 5 20th Anniversary Edition - Releases 2016-September-15 for 13,800 yen.

The 20th Anniversary Edition features the following (screenshots are the end of this post):

• Persona 5 Artbook
• 5CD ALL TIME BEST ALBUM
  • Disk 1: Persona
  • Disk 2: Persona 2 IS/EP
  • Disk 3: Perosna 3 / Persona 3 FES
  • Disk 4: Persona 4 / Persona 4 the Golden
  • Disk 5: Persona 5
• DLC Persona - Thanatos (P3&P5 versions) and Izanagi (P4&P5 versions)

• DLC Costume + Battle BGM pack from P3, featuring the Gekkoukan High uniform

• DLC Costume + Battle BGM pack from P4, featuring the Yasogami High uniform
• Custom theme (not entirely sure on this)
• "Art Treasure Box" (AKA it comes in a box)

Atlus have also uploaded PV04 (shown in the live broadcast) to YouTube. Thanks to @mattyftm for pointing this out:

Persona 5 the Animation will also air in September 2016.

There will be an orchestral Persona concert (associated with the 20th Anniversary) on 2016-August-13, and some sort of anniversary edition in December 2016 (not sure what - my Japanese was nowhere near good enough to follow that bit).

More details from the show to follow.

Please note that my Japanese is near non-existent, so there may be minor translation issues with this blog (I believe it to be accurate)