The poor [graphics] drivers have made it difficult to push either of them, and the developers arent familiar with the hardware yet, said one source. Another stated that well begin to see far greater use of each platforms unique features once were past the first wave of releases, when developers have more time and experience with each consoles quirks.
One source even suggested that enforcing parity across consoles could become a political issue between platform holders, developers and publishers. They said that it could damage perceptions of a cross platform title, not to mention Xbox One, if the PS4 version shipped with an obviously superior resolution and framerate; better to castrate the PS4 version and release near-identical games to avoid ruffling any feathers.
This claim was later countered by a contact at a different studio. It would be totally fine for us to make one version prettier without any political difficulties but it usually doesnt make financial sense, they said, unless its a very simple tweak.