The general upscaling that comes with porting projects to current-generation consoles probably won't be as noticeable with games like the visually-simplistic Minecraft. That's alright, improvements can still be made on elements more important to the game's focus! 4J Studios, the studio working with Mojang on porting the customization-driven builder to Xbox One and PS4, noted on Twitter that world sizes will be "a lot bigger" than what was provided in the Xbox 360 and PS3 versions.
Those looking for infinite worlds to match Minecraft's seemingly-infinite scope of possibilities won't find them in the upcoming versions, which 4J explains is due to save file size limits on both consoles. Still, it's good to know we'll be able to stretch our legs a bit more while we're running for our blocky little lives, hissing Creepers in tow.