not sure why you'd expect all them to necessarily have announced their projects at this point in time. Bear in mind Nintendo recently claimed there are like 80 Switch software projects CURRENTLY being worked on, so clearly like half of them are things that are still in the dark for us
for example - Sega announced very little but its hard to imagine they don't have a number of things projected to be on the Switch that are already in development, Sega games (like their older IP) generally sell fairly well on Nintendo platforms







