My guess on why they didn't announce this one ahead of time might legit be because "we saw you fucks get overhyped over shit we never promised last time, now we're not even gonna give ya'll the chance."
Main surprises for me personally were the announcement of the SaGa/Final Fantasy Legend Collection on Switch (been wanting to give this series a try, and yeah despite being rebraded as FF games in the West back in the 90s these games are part of a separate franchise called SaGa), that Taiko RPG that looks like it might be a lot of fun (and it's two games in one package too), and Puyo Puyo Tetris 2.