One of the earliest steps in the development of Fallout 4 started with Bethesda porting Elder Scrolls V: Skyrim to Xbox One.
According to a report by Game Informer, the team at Bethesda did the port to help understand what was then still unreleased, "next-gen" hardware. Development on Fallout 4 began before either the PlayStation 4 or the Xbox One had specs available to Bethesda. The Xbox One port of Skyrim was simply an exercise for Bethesda to familiarize itself with the hardware in anticipation of Fallout 4 landing on both consoles.
As far as an actual Xbox One port of Skyrim on the current-gen systems, Todd Howard said "don't get your hopes up yet."
The release of Fallout 4 is just a week away, which means there are still 7 agonizing days left to wait until we can explore the wasted remnants of Boston. The good news is that Fallout 4 can be preloaded on all platforms, meaning if you purchased the game digitally, you'll be able to start it up the second it's made playable.
Courtenay Taylor, one of the voice actors who worked on the game, compared Fallout 4 to a Pixar movie as far as the level of detail in the game is concerned. Taylor said no stone was left un-turned, and even places where the camera never goes have been given a high level of thought. "And the effect of that level of detail is going to be apparent," Taylor said.