1) Yes, the only real difference is that your PvP toggled all the time in open-world aside from probably starting zones; Freemarch/Silverwood, as well as in neutral/capitol cities.
2) I can't help you with this, and I'm unsure if anything has been posted about this, least to my knowledge there isn't anything.
3) There aren't really any differences that I can notice. Each side has basically all the same OoC abilities depending on which race ya choose. Also the only other passive abilities are PvE based.. kind of.
Hope this helps.