Advance Wars was already put on indefinite delay after the invasion of Ukraine back in March. I imagine it's because of the plot of AW1 (which starts with the "basically Russia" faction unleashing a surprise and unprovoked war on their neighbour).
It's been radio silence since (except for one comment to a journalist confirming that they'll announce something when they have a fixed date).
My personal guess is that it'll come out in 2023 when there are no other competing Nintendo turn based strategy games around it (e.g. Fire Emblem will likely be given priority).
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