According to recent rumors, there is a chance that an enhanced version of Persona 5, titled Persona 5 R, will be announced fairly soon. The base of this rumor is due to the fact that Atlus has registered a "P5R.JP" domain back in April 2017. And it's this same domain that was updated today, possibly signaling an incoming announcement from Atlus.
This rumor is most likely a real thing because the same pattern of this happening in the past with Atlus. For example, Persona Q2, Persona 3: Dancing in Moonlight, Persona 3: Dancing in Moonlight, Persona 5: Dancing in Starlight, and Catherine: Full Body all had registered domains that were updated within two weeks of their formal announcement. So with Atlus updates P5R.jp, then the fan-awaited announcement will happen soon. Some fans even speculated that the announcement for the game will be made at the end of the “Persona 5 The Animation Dark Sun” special anime, which will air in Japan on December 30. The first Persona 5 anime adaptation ended long before the end of the game, and this special should cover more of the story.
An enhanced version of Persona 5 with new scenarios and elements was also one of the possible votable options in an old Atlus survey, which asked fans what kind of game they’d like to see next. The Persona series isn’t unfamiliar with this practice, as Persona 3 had Persona 3 Portable on PlayStation Portable, and Persona 4 had Persona 4 Golden on PlayStation Vita. Both were enhanced versions of the prior games with new scenarios and elements.
Meanwhile, Persona 5‘s Joker will make a playable appearance in Catherine: Full Body, another remake, releasing on February 14, 2019, in Japan for PlayStation Vita and PlayStation 4, and in 2019 in the west. Along with the appearance of Joker as a guest character in Super Smash Bros. Ultimate, it's safe to say that Atlus is also using this opportunity to push the marketing for an enhanced version of Persona 5.
Persona 5 is currently exclusively available for PlayStation 3 and PlayStation 4.