I can answer the fist question for you. The game currently pays like Minecraft with First person being default, and you can go into third person if you want.
I’m not sure where they’re going to take PvP in the future, but I am sure it will be very open world pvp, with perhaps a few sanctuaries.
Dev’s have said gravity and physics are planned features, with things like friction, bounce gravity to be added to the prototype version soon. Further physics may be added at a later time. (hopefully!)