Yes, I was about to post it. Marik did post it on the fighting game thread... but since not everybody goes there, I'll post it here. Why there? Because...

Persona 4: The Golden announced for PS Vita

Atlus’ teaser website was what most of our readers suspected — a port of Persona 4 for the PlayStation Vita, titled Persona 4: The Golden. The Vita version adds new features reported by this week’s Famitsu magazine.

Amongst new additions to the game are new characters. One of these is Marie.

Another is the addition of more voiceover work for the Vita version; Persona 4 Golden will contain 1.5 times the voicework of Persona 4, as well as new songs. Also being added is a new opening movie, and new event and anime movies during the course of the game.

Persona 4: The Golden will also utilize the Vita’s online capabilities. You’ll be able to call for help if you’re having a hard time in the game’s dungeons. Finally, Famitsu mention a mysterious highly-requested feature that has also been added to the game but will be announced at a later date.

Persona 4: The Golden is slated for a spring 2012 release in Japan.
Source: Siliconera

And more info from gamefaqs:
A new character named Mary
1.5 times the voice of the PS2 version
Wireless support for calling on others to help you when you're about to die in a dungeon.
Other elements that fans of the original requested
New opening anime with new song from Shouji Meguro
New animation movies
A release is set for Spring 2012.
Then we have the reason for why Marik posted on the fighting game thread.

Persona 4: Ultimate Mayonaka Arena announced for Arcade, PS3 and 360.

This is a FIGHTING GAME developed by the same team behind BLAZBLUE!

The Persona 4 revival won’t stop with the anime and Persona 4: The Golden. Arc System Works are working on a Persona 4 fighting game, development of which is being handled by the BlazBlue team.

The game is titled Persona 4: Ultimate in Mayonaka Arena, as reported by Sinobi.

Interestingly, it takes place two months after Persona 4 and continues that game’s story. The fighting tournament is apparently being hosted by none other than Teddie.

Characters that are confirmed to be playable are Yosuke, Chie, Yu (the main character) and…Aigis?! Yes, the game will include characters from Persona 3 as well. Shoji Meguro will be composing music for the game and Katsura Hashino will be directing.

Persona 4 G: Ultimate in Mayonaka Arena will be released in Japanese arcades in spring 2012 and will follow on the Xbox 360 and PlayStation 3 in summer 2012 in Japan.
Characters from P4 confirmed: Main/Souji/Yu, Chie and Yosuke
Characters from P3 confirmed: Aigis

Source: Siliconera

And to end it... a Persona 5 Tease

This isn’t really news as such, but Famitsu magazine also reports that Persona 5 development arrangements are in place, and the regular Persona team will be handling development of the game.

Katsura Hashino will return as director, Shoji Meguro as composer, and Shigenori Soejima as character designer. No further details regarding the game have been provided.
Source: Siliconera