My personal wishlist:
Slow dancing definitely!
In laws and asking for permission.
Conflict if marrying when the in-laws deny.
Dad walking bride down aisle
Veils
LOTS of wedding dresses
Able to hold flowers while getting married
New ways of proposing
New marriage animations because the one now is just plain with a bunch of recycled animations.
Step children
A lot of fancy hairstyles. Would like some with jewels and flower intertwined in them.
Able to choose people for roles in the wedding, such as bride maids and such.
New casual romantic interactions in general.
Woohoo spots