A 1080p60 freeroaming action-RPG with high res textures, online but optional connectivity, great controls, near endless hours of gameplay, night-day-cycles, a good weather-system, believable AI in all NPCs, a number of storylines to follow, diverse enemies ranging from common thieves to demons, undead hordes and dragons (and eventually undead demon dragons) and a "free to play however the hell I want to"-system, which means I can have my Barbarian, Wizard, Warlock, Necromancer, Thief, and Ranger in one game.
Anything less than that will be considered a dissapointment.