On Sunday, Bandai Namco aired a trailer within their free-to-play title Mobile Suit Gundam: Battle Operation 2 for a new, upcoming Gundam game. The new title turned out to be SD Gundam G Generation Cross Rays. Only offering a tease at the series included, and a release window of 2019, the new trailer, which you can see below, informed viewers to visit Famitsu for more information later in the week.
Source: Destructoid SD Gundam G Generation Cross Rays announced for Switch, PlayStation 4 and Steam