Hot damn, this thread hasn't been updated in almost eight months, step it up Fakku.
Last week Atlus USA streamed a build of the game and they put it up on their channel. Todd Haberkorn voicing both Shos is greatness, but I still haven't heard the infamous "SHOTAIMU" line that his Japanese VA says.
Also Adachi is confirmed to be free DLC the first week of release. He's also got Terumi and The Joker color palletes, mahdik
http://www.siliconera.com/2014/07/01/persona-4-arena-ultimax-adachi-free-dlc-launch-americas/
And last but not least, the P4U2 TE2 stick that's interchangable between PS3 and PS4, no word on pricing or release date yet but I REALLY hope this comes to the States cause I could use a new stick myself.
http://www.crunchyroll.com/anime-news/2014/07/01-1/persona-4-arena-ultimax-gets-its-own-arcade-stick
Also if anyone wants to practice for Ultimax you can add my PSN ichikoga, just let me know you're from Fakku(I REALLY wish you can edit your ID's, ugh). I main Akihiko but I'm absolute shit with Narukami.