Just hooked up my PS4. No HDMI problems, no freezing issues, it connects to my wifi. The only thing it won't do is allow me to sign in to my PSN account.
It just stays on a loading screen and won't continue, no matter what. Like I said, I'm connected to the internet, and every time I check the connection it connects no problem.
I think I'll just leave it for tomorrow and get to having ACIV install.