There has been a push for Persona 4: Arena to be at MLG as of late. If you want Persona 4: Arena to have a successful tournament scene (and if you don't, GET OFF THIS SITE!!! WHY ARE YOU HERE ANYWAYS???
) be sure to check out Lord Knight's thread here
and be sure to sign the petition here
Next, if you live in England and want another chance to play Persona 4: Arena, you'll have an opportunity to do so on July 1st. The game will be playable at London Anime Con. Details are available here
Finally, Atlus has revealed what some of the DLC for Persona 4: Arena will be. There will be alternate character colors, alternate glasses colors (which means it seems that there will be some glasses colors available on-disc), battle announcers (like how Rise is), and menu announcers. No news on if there will be DLC characters yet.