Mine's still not signing in. Very annoying and some of my games are locked, but as the server is down I can't Restore my Licenses. I'm not convinced Sony have fixed anything, tbh.
I suspect the DDOS on Live and PSN did stop yesterday. XBL was just quicker to recover and is better prepared for the million ish people who then fired up their new systems. PSN was coping fine with the current users (despite some terrible problems a couple of months back). I suspect they just don't have enough capacity for the existing and new users to log on to the PS4 network. People who are logged on are just lucky as the USA is asleep
The same would have happened without the DDOS in my opinion.
Anyway, hopefully it will be fixed tomorrow. Being a long term member of PSN, I won't be surprised if we don't see any announcements/updates/fixes at the weekend, as has been proven in the past.
rp2000