According to the press release, the engagement begins with matching rings, then a trip to the matchmaker. The actual wedding itself can be celebrated with decorations, guests, and fireworks, after which time each character receives a title identifying them as married.
But wait, here's the best part: the 'Couple Cultivation Skill' lets couples receive double experience for team combat! There is probably more to it than we might glean on the surface, and we'll do our best to find out what that might be. WoKF is in open beta, kids. Check it out now!