Hypothetical discussion because WoW II is unlikely but what would your WoW II be like?
For me:
It would be set 100+ years in the future
Horde and Alliance are now one faction
Vastly improved graphics but retaining the art style
Legacy characters (can import WoW characters over with all mounts toys and mogs exclusive)
New worlds to visit
Two new classes
Two new races
Available on PC, XBOX & PS