The recently-finished Persona series livestream hosted by Atlus has proven to be eventful especially for those awaiting Persona 5 news, treating fans not only to more footage of animated cutscenes, but also first looks at main characters and gameplay. Bolstering the Persona 5 preview momentum is an article from Siliconera announcing that first print copies of Persona 4: Dancing All Night for the Vita will include a Blu-Ray disc with content previewing Persona 5.
Persona 4: Dancing All Night releases in Japan on June 25, 2015. Persona 5 is also tentatively set to release in 2015 for both Japan and North America, so it appears we may be looking at a Q3 2015 or Q4 2015 release window for Persona 5.