The Metro and Stalker games are incredibly atmospheric post-apocalyptic shooters, but where Stalker is set in a sprawling open world, Metro is a far more claustrophobic and linear experience. But it sounds like Metro developer 4A Games might just be aiming for something a little more Stalker-like in its next game.

In a lengthy interview with Eurogamer , 4A Games Chief Technical Officer Oles Shishkovstov talked about "the performance differential between Xbox One and PlayStation 4," the difficulty of developing for multiple platforms, the strengths and weaknesses of different APIs and all that sort of thing. It's good stuff if you're into that sort of thing, but the really interesting bit, at least for me, came around the midway point when he was asked if he could talk about what the studio is currently working on.

"For the game we are working on now, our designers have shifted to a more sand-box-style experience - less linear but still hugely story-driven," he said. "I will not go into details, but it requires some work from programmers as well."

It's only a couple of sentences and nothing more is said about it, although to be fair, it's a Digital Foundry interview focused on developing for the new generation of consoles. But the possibility of an open-world Metro game is incredibly exciting. And it's also the sort of thing that 4A Games might actually do: It was founded in 2005 by former members of GSC Game World, the studio that created the Stalker franchise.