According to a WHOIS domain lookup concerning the site persona5.jp, Index Corporation have registered the aforementioned domain name as recently as June 25, 2013.
This could potentially be a sign of upcoming news regarding the title, or it could also be some kind of mistake. It could also be that they are registering the domain as a precaution for the future. Who knows, but in any case, it’s a new sign of potential life regarding Persona 5 and it is exciting.
Here is a picture of what is currently displayed on the website (which is to say, not much):
And here is all of the information regarding the Whois domain lookup (note the registrant as being Index corporation):
Domain Information: [Domain Name] PERSONA5.JP[Registrant] Index corporation. [Name Server] dns1.onamae.com [Name Server] dns2.onamae.com [Signing Key] [Created on] 2013/06/25 [Expires on] 2014/06/30 [Status] Active [Last Updated] 2013/06/25 16:39:27 (JST) Contact Information: [Name] Whois Privacy Protection Service by onamae.com [Email] proxy@whoisprotectservice.com [Web Page] [Postal code] 150-8512 [Postal Address] Shibuya-ku 26-1 Sakuragaoka-cho Cerulean Tower 11F [Phone] 03-0364-8727 [Fax]