More maintenance of the mysterious sort is expected to hit the Playstation Network in about an hour (12am Pacific), but it won’t affect normal use. Wait, what?
That’s right, as strange as it sounds, you’ll be able to sign in to the PSN as normal during the maintenance period (which is only expected to last about two hours anyway). Online play and apps? Yep those will work just fine too. Here’s the kicker- everything’s only functional if you’ve signed in at some point in the past few days.
So needless to say, if you think you might want to log in during the ‘down time’- get hopping and do so right now.
What the full story here is and why recent users are a-ok is anyone’s guess. Sony’s being predictably mum on the subject so I wouldn’t expect an answer if I were you.