I don't see a general Direct happening considering we've already seen trailers for games like Astral Chain, Fire Emblem, Link's Awakening, DQXIS, Builders 2... Their follow up trailers should be at E3. So either they have a a new general Direct in April and don't mention these games, which would be strange since they're so important, or they do mention them, which seems redundant and unlike the usual marketing cycle. I don't think either are happening.
I do agree that we should see Mario Maker before E3 though. Remember that Arms Direct that also included a Splatoon 2 trailer? I could see something like that.