Nintendo most recently had Advance Wars 1+2: Re-Boot Camp set for an April 8 launch on Nintendo Switch, but those plans have changed in light of the ongoing Russian invasion of Ukraine. While Nintendo doesn't state that specifically, it cites "recent world events" as the reason for delaying the military strategy-RPG remake.
There's currently no new release date in place, so we'll have to stay tuned for further updates.
In light of recent world events, we have made the decision to delay Advance Wars 1+2: Re-Boot Camp, which was originally scheduled to release on Nintendo Switch on April 8th. Please stay tuned for updates on a new release date.
— Nintendo of America (@NintendoAmerica) March 9, 2022
The updated version of the Game Boy Advance Advance Wars games was originally scheduled for December 3, 2021, but back in October Nintendo announced a delay to Spring 2022 for "fine tuning."