I just received this from Capcom. It looks like Episode 5 is now up to download for 100 Wii Points.
We just wanted to let you know that Ace Attorney’s Episode 5: Rise from the Ashes is now available for download on WiiWare!
Episode 5: Rise from the Ashes is a special final episode created for Phoenix Wright: Ace Attorney . “Rise from the Ashes” is set two months after the events of Phoenix Wright: Ace Attorney’s last episode, “Turnabout Goodbyes.” This episode is also the longest in the Ace Attorney series to date, spanning ten chapters (three investigations and seven trials). In order to play this piece of DLC you need to own Phoenix Wright: Ace Attorney on WiiWare. “Rise from the Ashes” is available in North America for 100 Wii Points.