Unless you're desperate to play Ratchet and Clank or Uncharted it would be prudent to wait until rumours of PS4K become facts about what Sony is actually planning, which I hope isn't a PS4K, but just slim and perhaps a minor internal redesign to improve performance.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix