Despite some early reports to the contrary, Fallout 4 will not be coming to last-gen consoles. In fact, Bethesda claims that it's simply not possible to bring the game to weaker hardware.
Some enterprising fans found mentions of PS3 and Xbox 360 versions in Fallout 4's teaser site before the countdown concluded, but once the game broke cover, only PC, PS4 and Xbox One versions were explicitly announced. It was possible that, like many games, another company or division of Zenimax was handling a separate port, but Bethesda has now shut this down in the clearest way possible.
"It is not coming to 360 and PS3," Bethesda’s global community lead Matt Grandstaff wrote on NeoGAF, "the stuff we’re doing will never work there."
So there. The "stuff" Grandstaff refers to both refers to graphics (which look reasonable in the gameplay trailer and benefits from delicious lashings of vibrant colour to compliment the typically bleak wasteland vistas and presumably the size and scale of the open world, not to mention the numerous overlapping systems with which it will presumably be stuffed.
We'll find out more about Fallout 4, which is rumoured to release this year, during Bethesda's press conference this Sunday. Stay tuned!