Square Enix have announced that Kingdom Hearts: Dark Road has been delayed. The game within Kingdom Hearts: Union χ was scheduled for release this spring, but has now been pushed back to an unannounced date.
The company stated the following:
Due to current conditions, development for KINGDOM HEARTS DARK ROAD has been delayed. We apologize for the late update, as we were trying to find some means of making a Spring release. Another announcement will be coming in early June, so please stay tuned.
Kingdom Hearts: Union χ is available on Android and iOS.