No limits on first party titles as far as used games go. Publishers are free to do what they want as far as DRM.
I'm not an EA fan, but I would like to remind people that EA announced less than a month ago that they were abandoning the their Online Pass for existing and future games.
And yes, multiplayer on PS4 will require a PS+ subscription. But has other have already pointed out, the value for that service is very good. Lots of free games, discounts on games, a good feature set overall...which is more than I can say about XBL Gold.