PS4Slim direct communication with DualShock 4, and now shortmaneighty2 revealed what may be PS4 Slim 5 GHz Wi-Fi support according to a PlayStation 4 Slim user manual screenshot and direct screen capture from the Internet status page!
To quote from DualShockers.com on the find:
"Shortman just posted on Twitter a picture of the manual that indeed indicates 5 GHz support and one of the console’s UI.
While the “Wi-Fi frequency band in use” option says 2.4 GHz, because that’s what Shortman is using, the option isn’t present at all in the original model, which also appears to confirm support for different bands."
Below are some related Tweets from shortman82 also: