You may have heard of the hubbub that the developers of Ryse: Son of Rome caused when they announced that the game would run at 900p resolution instead of 1080p. Microsoft’s Aaron Greenburg recently clarified that the choice of native resolution is up to the developer, however the Xbox One will automatically upscale resolution to 1080p.
However, we’ve left the decision up to individual developers to determine what resolution best fits their own design goals. Xbox One will present all titles at 1080p either natively or upscaled by the Xbox One.
It seems that the Xbox One really does support up to 4k resolution, Microsoft just doesn’t seem to be forcing developers to create games at that level. Cevat Yerli of Crytek has revealed more on the decision to have the game on 900p instead of 1080p through twitter. Apparently it was a matter of efficiency, pertaining to lighting/shading and polygon counts.
#Ryse Hero Marius 85k polys? It was choice: 150k polys w LODs vs 85K + better shading + no LODs (stable). The latter wo at better quality!
— Cevat Yerli (@RealtimeCevat) September 27, 2013
I mean, can you truly see any discernable difference between 900p and 1080p?