The latest AdventureQuest 3D developer blog has been posted that lays out some of what players can expect when the big PvP update launches into the game. Primarily, the team wants its players to know that "PvP will be completely optional in AQ3D and the way we implement it will attempt to reduce the toxicity usually associated with it".
The PvP update will begin rolling into the game in March with Phase 1 that includes the PvP stadium and arenas. As players enter the arena, they will take on others. If they die, they will "respawn in random places and there may be some additional surprises and 'other things' happening while you battle". Players can earn trophies for participation.
What the other phases will include remains to be seen.
Check out the full post on the AdventureQuest 3D site.