
The newest issue of Persona Magazine, P5 Special, was recently released and new, upcoming Persona 5 books have been announced.
Persona 5 Official Complete Guide
The Persona 5 Official Guide Book will be released on September 15, 2016, however another guide called the “Persona 5 Official Complete Guide” has been announced as well.
This new guide book—which will presumably be more in-depth than September 15’s Official Guide Book—has not been given a release date.

Persona Magazine P5 Special 2
Persona Magazine P5 Special was released on September 8th, featuring several pages of Persona 5 related content. Following this, a “P5 Special 2” issue has been announced within the magazine, with a TBD release date.
The next Persona Magazine has been announced for a Fall-Winter 2016 release window, and the next issue will presumably be “P5 Special 2.”

Dengeki PlayStation Vol. 622 & Vol. 623
Furthermore, the P5 Special issue confirms that Dengeki PlayStation magazine Vol. 622, releasing on September 15, will include a 30-page Persona 5 feature, along with a Katsura Hashino interview. (via @MysticDistance)
Dengeki PlayStation Vol. 623 releasing on September 30, 2016, will also include a Persona 5 feature.

The previous issue of Persona Magazine was #2016 March on February 23, 2016, which featured Persona 3 The Movie, Persona 3 and Persona 5.
Persona Official Magazine is an ongoing, Atlus backed magazine about the goings on of the series that releases on an irregular schedule. It had an original run of 11 issues from 2011 to 2012, and it made its return on December 5, 2013 with its #Re:birth issue.