According to Destructiod, the parent company of game maker Atlus, Index Corporation, has filed registered a domain for Persona 5. The website says not to look too much into the registration, as the company might just be grabbing the domain so no one else can.
I know plenty of fans who might be excited. Especially Vita players who grabbed the awesome Persona 4 Golden last year. If an announcement does come, hopefully it comes to as many systems as possible.