Retro Studios said on Twitter that they are looking to hire engineers, artists and animators.
Presumably, this is because they need more staff for a new project they are working on, and that project would in all likelihood be releasing on Switch.
This isn’t much of a surprise. I mean, a Nintendo-owned studio that hasn’t made a game in a few years is working on something new.
Still, it doesn’t hurt to know that they are indeed working on something.