I feel a fun PvP idea would be having 10v10 map of one class team versus the same class on the opposing team.
For example:
- 10 Warriors VS 10 Warriors
- 10 Death Knights VS 10 Death Knights
- 10 Druids VS 10 Druids
- 10 Mages VS 10 Mages
etc …
To make things more fun, perhaps design Battleground or arena maps that cover the aesthetics of each & every class 
Anyway! 
Feel free to share you ideas for what class map you’d like to see designed to cover the general vibes of your favourite class — or what one you would choose for the showdown that you’d love to have with the team & enemies of the same class? 