As the Slim for me offers nothing new that I can't get with my launch PS4, I've got no interested in it unless we get a super cool special edition.
Now the Pro is a different question as I don't own a 4KTV but have been looking bit as I bought a car, can't really afford the TV I want as I want to do everything and not pay silly money.
Which rules out one of the main things of the Pro how ever games will be improved on a 1080p TV, The Witness for instance has been confirmed it go from 900p to 1080p along with improved antialiasing and draw distance along with overall improved visuals.
That does tempted me especially as it's out near FFXV which doesn't run that well from the demo's on PS4 and that E3 demo on the Xbox stage ran like shit, so if the framerate goes up to a locked 60fps and 1080p then I could be tempted.