It seems to be a disappointingly incremental upgrade.
Apparently, the very first round of documents that first leaked the existence of the upcoming PlayStation 4 NEO a few months ago have now leaked, and they confirm a lot of what we have been told about the console for a while now- an upgraded version of the PS4 is in the works.
The documents also confirm the specs for the console, confirming that it is going to be a highly incremental upgrade over the base PlayStation 4 system, and that it is going to be outclassed, in sheer hardware terms, by the Xbox One Scorpio. Some highlights:
The full document is highly interesting, and you can check it out here. It emphasizes that the upgraded PS4 will only be a part of the larger PS4 ecosystem, and that it will maintain full cross compatibility with the existing PS4 too.
The PS4 NEO has been officially confirmed- no other details about it, however, have been officially confirmed yet.