We reported last month that a demo for Splatoon 2 is coming in March, and although this doesn't start until March 24, you can now download the client.
Images online, in places such as Imgur, have shown that you can download the Global Testfire by looking for it on the Switch eShop, and although Japan and North America are the only confirmed regions to have it on the storefronts right now, Europe's is probably not far away if it's not there yet.
What does Splatoon 2 need to do to improve on the first game?
Thanks, VG247.