According to the response given by Bethesda’s Spanish account, it seems that the game is still being worked on. Based on the translation, it sounds like Bethesda is still polishing up the game and optimizing it so that it looks as good as possible. They also address the question of DLCs, saying that they have no news at the moment which means that there is a good chance the game might launch without the DLCs.
¡Hola! Estamos centrándonos en pulir el juego base y optimizarlo de modo que luzca lo mejor posible y el rendimiento esté a la altura de DOOM. Así que por el momento no tenemos noticias sobre los DLCs.
— Bethesda Español (@bethesda_ESP) April 6, 2018
Wolfenstein II: The New Colossus was launched on the PC and consoles back in 2017 so as far as Bethesda titles are concerned, this is probably the most modern title that they have released for the Switch thus far. The company has released Skyrim and DOOM which makes Wolfenstein II the third and latest title for Nintendo’s console.
Unfortunately fans will have to wait and hopefully we will be able to get a more concrete release date soon. In the meantime we suppose fans will just have to remain patient.