Rumors of a new Wolfenstein game picked up during E3 2016 when something called New Colossus was displayed at the beginning of Bethesda’s E3 Press Conference.
Now it seems like rumors are circulating again as Brian Bloom, the voice actor of B.J. Blazkowicz, hinted that the game was in development and would be coming soon. Bloom wasn’t the only one as Alicja Bachleda-Curuś, the voice actor of the character Anya, revealed in an interview in 2015 with a Polish channel that a new Wolfenstein came was in development and would be released in a couple of years.
Keep in mind that it’s still possible that if these rumors are true it could very well be delayed until 2018.