A few hours ago, Sony started pushing PS4 Firmware 5.53
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As usual the only 'changelog' entry is: “This system software update improves system performance” and normally that means something has been patched, which @Mathieulh has confirmed the currently available webkit exploit is closed, but no big deal as it was not a kernel one anyway, but it does mean Sony keeping an eye open what is being released out there in the wild.

As you can see above, the new firmware allows you 'cut down' the amount of 'public data being shared out' which is most likely the main reason for this update as Facebook got into trouble recently with this, but if you looking for 'future hacks' don't upgrade yet!

NEWS SOURCE: PS4 Firmware 5.53 has been released (via) Wololo