The NEO will feature a higher clock speed than the original PS4, an improved GPU, and higher bandwidth on the memory. The documents we’ve received note that the HDD in the NEO is the same as that in the original PlayStation 4, but it’s not clear if that means in terms of capacity or connection speed. Starting in October, every PS4 game is required to ship with both a “Base Mode” which will run on the currently available PS4 and a “NEO Mode” for use on the new console.
The article has many more details regarding the upgraded console and what Sony will require of developers, but it really doesn’t read like a huge upgrade to me, and it certainly won’t be true 4K. Even a high-end gaming computer can’t hit 4K at a good framerate for big 3D games.
For now, original PS4 purchasers are good, but I would be surprised if a year into the release of this new console the original “base” PS4 isn’t discontinued in favor of the NEO, and then soon after the requirement that developers target both consoles is dropped as well. Either way, don’t buy a Playstation 4 until you hear Sony give plans publicly at E3.