The game could be released depending on the success of Ace Attorney 5.
The ruling may not be final when it comes to Ace Attorney Investigations: Miles Edgeworth 2 being released outside of Japan, according to Capcom USA's Christian Svensson.
While he noted that AAI 2 is not being "held hostage" over sales forecasts for Ace Attorney 5, it of course wouldn't hurt if it does well in sales.
Svensson made it clear that Capcom USA set sales projections much higher for AA5 than previous entries, just to ensure its release in North America.
Ace Attorney Investigations: Miles Edgeworth 2 was released in Japan on February 3, 2011 for the Nintendo DS. It has not been discussed just how a possible localization would be sold here.