Bethesda Softworks VP of PR and Marketing, Pete Hines explained the delay to Polygon:
Working on next-gen and current gen definitely has an impact, you’re developing for two different things. The fact that the next-gen stuff is still moving is also definitely a factor. But the most important thing was definitely just looking where it was at, what they needed to polish. Because it’s just not trying to be a shooter, because it’s trying to be a shooter that also has driving elements, story elements, narrative, stealth sections — each one of those has to be excellent. It’s not just like we’re making a shooter, where if the shooting is good, then all 16 hours of the game will be good because it’s all we’re doing. We didn’t just want to do a one-note Wolfenstein game. We wanted to make something that brought in all these elements, and as it turns out, the polish time you spend on the shooting stuff has no impact on what it feels like in the stealth part.
I don’t know why they can’t just focus on this gen first, and upgrade the next. It’s just a curiosity of mine, I mean no offense.