That's old. The AMD (GPU) itself saind that.
http://www.tomshardware.com/news/AMD-XBox-720-Xbox-720-Avatar-Graphics-Neal-Robison,13095.html
"AMD is adding that the console will be capable of producing graphics with Avatar-levels of detail"
Now we need to know what is "Avatar-levels of detail"... maybe it's not the same level of graphics.