An opinion article at GameZone agrees with Morzy, that a new version when the capabilities of the original haven't been maxed out yet is bad timing:
http://www.gamezone.com/originals/th...-everyone-jzyi

Though it has some valid points, I'm not entirely sure if I agree. All consoles have had multiple newer models come out throughout their lifespans. It may come down to being mainly a marketing issue. Hype Neo too much and it ends up making the regular PS4s look bad. Don't hype it enough, and people are left wondering why bother with the new one. This is essentially just a new model PS4, not all that different from the many times that PS1, 2, or 3 came out with newer models with slightly upgraded hardware. But this time, Sony seems to be hyping the new one more, by upgrading its platform name to "4.5". That might put it into the "too much hype" category where it makes their current product look bad. But that's marketing having that effect, more than the product itself.