Heeey I translated the demo in case anyone is interested! http://snobbishly.tumblr.com/post/50571196796/ace-attorney-5-demo-translation
mod note: Cool! Our own Rubia Silva Ryu also translated the demo here: http://www.forums.court-records.net/viewtopic.php?p=1202148#p1202148
I don’t think there’s been any official word yet, sadly. Hopefully they’ll announce it sooner or later.
Capcom’s made a slight adjustment to the trailer that plays at the end of the GS5 demo. Watch through to the very end, and you might just catch a glimpse of a certain prosecutor…
Capcom’s also put up a brief commercial for GS5. Watch and be amazed at Phoenix’s amazing animated hair.
The official GS5 site has updated with art for Edgeworth, Trucy, and Ban, screens for the former two, and a whole bunch of case 2 media. Let the good times roll!
The ever-reliable hoso_boso has written up an excellent summary of this week’s Famitsu article. While there isn’t much said about Edgeworth and Trucy we can’t see from the screenshots, there’s plenty of other info:
New character: Detective Gouzou Ban (番 轟三)
A hot-blooded detective who has worked with Prosecutor Yuugami many times. He encounters Apollo and co. during their investigation. Funnily enough, his catchphrase is “justice”!

Details on case two:
Case two kicks off when Apollo and co. are invited by Trucy’s friend Yumemi Tenma (天馬 ゆめみ) ti attend a party to celebrate Kitsune Village’s revitalization. Unfortunately, once they get there, a murder happens (as always) - the village mayor is found dead.

(Pictured above: Yumemi)
Yumemi is the daughter of the head of the Tenma family (天馬 出右衛門 - sorry, not sure how to read the first name). Her father is arrested for the mayor’s murder. But Yumemi thinks the real criminal is the demon “Tenma Tarou”! (天魔太郎)
Tenma Tarou is a character created to celebrate the village’s revival, and his rival is the Great Kitsune. As part of the party, the characters were to fight it out.

(Pictured above: Yumemi’s father)
Other characters include Kumabee Zeniarai (銭洗 熊兵衛), who manages the mayor’s mansion, and Hideichi Bibain (美葉院 秀一), one of the Tenma family’s secretaries.

(Pictured above: Kumabee)

(Pictured above: Hideichi)
Hopefully the official GS5 site will update soon and give us a better look at all this, eh?
Aaand here’s a subbed version of the demo trailer (turn on annotations). Nothin’ too crazy, but still fun!
And speaking of trailers, here’s the new trailer from the demo (sadly sans subs).
逆転裁判5 弁護士 成歩堂龍一 ここに復活!!
For those of us who can speak Japanese (or not), Capcom’s put up a web demo for the game covering the early bits of case one. And there’s a shiny new trailer at the end!
What was a rumor no longer is. Miles Edgeworth and Trucy Wright join the fight in Dual Destinies.