The American Girl site itself reveals a little bit of information about the Girl of the Year (GOTY) doll for 2010. From the Events page:

Girl of the Year Activity Day

Lanie Book Cover Your girl can celebrate the arrival of our 2010 Girl of the Year during an event that’s inspired by a love of the outdoors! Your girl can participate in a scavenger hunt, and then make her own nature notebook and flower bookmark. Free and open to the public. For girls ages 8 and up.

Event details by store

  • Atlanta: January 1, 2, 3; February 28
  • Boston: January 1, 2, 3, 10; February 26; March 24
  • Chicago: January 1, 2, 3, 9, 16, 18, 23, 30; February 6, 20
  • Dallas: January 1, 2, 3, 29; February 13; March 7
  • Los Angeles: January 1, 2, 3, 18; March 6
  • Minneapolis: January 1, 2, 3
  • New York: January 1, 2, 3; February 5; March 26

Girl of the Year 2010 Celebration

She can be one of the first to learn about our Girl of the Year 2010—an energetic girl who loves outdoor adventures. At this special event, girls can enjoy a delicious meal, icebreaker activities, nature crafts, and an introduction to the new contemporary character! Reservations required. For girls ages 8 and up.

Event details by store

Girl of the Year Flower Bookmark Activity

Girls can make a craft inspired by nature! During this fun activity, they can decorate a bookmark with floral designs that are inspired by our 2010 Girl of the Year’s love of the outdoors. Free and open to the public. For girls ages 8 and up.

Event details by store

Girl of the Year Nature Notebook Activity

Your special girl can celebrate the debut of our 2010 Girl of the Year, who loves to be outside in the sunshine. During this hands-on activity, girls will be able to make their own nature notebooks. Free and open to the public. For all ages.

Event details by store

Thanks Lena for leaving a comment about this and letting me know.
Now we just need to know what the GOTY will look like and what her name is!