Did they? Totally forgot and thus, it seems that Nintendo and I think alike. Hence, DLC in February is almost a given...
I'd expect something for Mario Kart 8 due to the rumours earlier. Odyssey is also likely, it takes time to come up with a new kingdom after all. No remake is getting DLC, and then we have games like Super Mario Party and ARMS left. My money is on the former two, though.