No, they aren't going to bring Battlegrounds back. It's only Caith working on PvP all alone as it is, and he stated a few years ago now that he can't keep 2 types of gear going (PvP and PvE). Thank goodness, too: I can't stand the mouse-in-the-wheel-going-nowhere repetitiveness of the same few tiny rooms over and over again anyway. Why do that when you can have new ground constantly under your feet for 120 levels (or, okay, til DoV or whenever they run out of gear revamps and have to shutter the PvP-TL). Never knowing who is around the next corner while questing, harvesting and leveling across an open PvP server is the most fun, to be honest.