GS5 has been announced!!  So far all we have is the logo with a giant red number five, so start your speculators speculating!
Gyakuten Saiban HD
Capcom has also announced Gyakuten Saiban 1-3 remakes in "HD" for iPhones and iPads.

Professor Layton vs Gyakuten Saiban

Level-5 and AA series creator Takumi Shu have teamed up to do a Layton meets Phoenix crossover game!  It features Layton, Luke, Phoenix, and Maya being transported into a magical world where they're called upon to solve a dangerous mystery.  As of TGS 2011 it has been tentatively confirmed for an overseas release.  Release in Japan will presumably be sometime in 2012.

The game will also feature animated cutscenes, with Layton and Luke voiced by their normal voice actors, and Phoenix and Maya by their actors in the upcoming Live Action Ace Attorney movie.

See the official site 
here.

Gyakuten Saiban Live Action Movie

Takashi Miike is directing a live action movie version of Ace Attorney, set to come out sometime in the spring, 2012.  It will star Hiroki Narimiya as Phoenix Wright, Mirei Kiritani as Maya, and Takumi Saito as Edgeworth. 
Gyakuten Kenji 2
Gyakuten Kenji 2 was released in Japan in Feb, 2011.  It again featured Miles Edgeworth in the lead role, solving a variety of murder cases with his sidekicks, Gumshoe and Kay.  Unfortunately Capcom has stated they don't have any intention of an overseas release at this time, but you can read up on some of the new cases and characters here on Court Records, or join the Localization Campaign effort.

If you have any new news to report, feel free to send it along to Croik at courtrecord @ gmail.com.