Inazuma Eleven Ares was originally slated to launch this summer for PlayStation 4, Nintendo Switch, iOS, and Android, but was later delayed until fall, making this the second delay the title has received. Reasons for the delay are currently unknown.
Inazuma Eleven Ares will (allegedly) launch this winter in Japan for PlayStation 4, Nintendo Switch, iOS, and Android, with a 2019 release window for North America and Europe. It will be the first game in the Inazuma Eleven series to receive a North American release since the digital Nintendo 3DS re-release of the first Inazuma Eleven in 2014.
It is currently unknown if all versions will be released outside of Japan.