Nintendo has yet to release any custom Switch consoles along with their big games, but this is going to change with the release of Splatoon 2 on July 21. Via their Japanese site they've revealed a special bundle, and it comes complete with both a console and Joy-Cons with a Splatoon inspired design. In addition to this, there's also a special Pro controller and various cases being made.
It's worth noting that this these Joy-Cons are only part of the Japanese Splatoon 2 bundle, and will launch separately in Europe in the fall. The new Pro Controller, however, will launch alongside the game here as well.