Wolfenstein 3 is the final game in the rebooted series that takes place after Wolfenstein II: The New Colossus and Wolfenstein: Youngblood. The game will finish the trilogy. It will be developed by MachineGames and be published by Bethesda Softworks. This was confirmed by Jerk Gustafsson during the E3 Coliseum reported by PCGamesN on June 14, 2017. Jerk Gustafsson said mentioned by PCGamesN: "Them finishing the trilogy depends on how well Wolfenstein II: The New Colossus does." Wolfenstein II so far has "generally positive" according to the Wikipedia and Metacritic so this means we have a great chance of having a sequel. It is currently unknown when it will be released but maybe sometime in the future, all type of info about Wolfenstein 3 is not released to the public yet.
According to creative director Jens Matthies, in the game we will see Mecha-Hitler, and according to MachineGames designer Andreas Öjerfors, “It would play with the format a bit,”.
It is rumored in Wolfenstein 3 that the long awaited Sun Gun will appear in the game. Bethesda’s Pete Hines has confirmed that Youngblood is a side story, which “moves ahead in the timeline. Therefore, Wolfenstein 3 will also be the sequel to Wolfenstein Youngblood.