http://www.youtube.com/watch?v=mijzjq7FNLs
The Official UK Trailer for Alice in Wonderland (by Tim Burton) has an extra minute at the beginning showing new scenes of Alice Kingsley (Mia Wasikowska) previous to her third trip to Wonderland.
[ 
Here be Spoilers]
Alice is 19 years old, she attends a party at a Victorian estate, a mansion of her family (maybe her aunt Imogene) and suddenly in front of everybody (hundreds of snooty society types) she gets asked in marriage by a guy who looks not of her interest, so she just runs away from the situation (and maybe after the White Rabbit) finding the tree and the hole where she fell down years before (well she was sleeping in one branch at the end of the first fairy tale). She returns to Wonderland after 10 years.
You can also see the review of original trailer.
Screenshots
Here are some Screenshots to from the extra minute:
