Those with a European eShop account can now play a bit of Kirby Star Allies for themselves. Nintendo also uploaded a new trailer showing off gameplay while announcing the playable demo. This particular video includes footage of a certain boss fight, so some may want to avoid watching to prevent spoiling it.
Not too long ago, a rumour surfaced that suggested a demo would be coming out on March 4, 2018. The demo is not out yet in North America, but it may be coming soon.
Kirby Star Allies for the Nintendo Switch will release in North America, Europe, and Japan on March 16, 2018.