Supporting the video's legitimacy is that the same person who bought the redesigned PS4 that we've seen pictures and video of has confirmed it According to @shortman82, it seems to be a see through section on the touchpad, which should also mean it won't impact the DS4's battery life (which is notoriously short, and the reason Sony added the ability to dim the lightbar in 2014 via a software update). Of course, until something's announced we won't know for sure what is or is not on the way, but take a look for yourself.

Update: ZRZ followed up with a full unboxing video of the PS4 slim along with its controller that showed the console running, but now has pulled all of the material. According to the channel's operators this is due to copyright claims from Sony. Based on that, and everything we saw in the video it definitely appears to be legit (the new PS4 box shows the controller's lightbar shining through the touchpad too), so now we're just waiting for an announcement by Sony.