I'm watching Hi11Zones live stream of his early PS4 unboxing/gameplay... His HDMI out is malfunctioning and now he's spent an hour to two troubleshooting the issue with no results. Maybe its just his early release model? But possibly something to worry about...?
PS4's haven't been released yet... There are a few unboxing videos, but even fewer gameplay videos. There are around 6 reported cases of faulty PS4 systems already. There's a 134 page thread about the topic on Neogaf.