Hi Mara,
Oh you must thrilled that your vacation to The Happiest Place on Earth is just days away! Disney's Frozen melted our hearts too.
The kingdom of Arendelle is doing well, so
Anna & Elsa of Frozen have decided to stay and build a snowman in Fantasyland for Meet 'N' Greets. If you look between Pinocchio's Daring Journey and Village Haus Restaurant, you will find their friend, Olaf, who like warms hugs and summer.
Each day as you enter the parks there is a guide that will tell you which characters and where they may be found. You can also ask any Cast Member.
I have not heard if Anna & Elsa will be added to Ariel’s Disney Princess Celebration Character Dining Experience, however it is always a possibility in the future.
The Disneyland Resort will carry Frozen merchandise throughout the a lot of the gift shops. I would also look at the World of Disney store located in Downtown Disney, that is always my go to place for souvenirs.
A good website I like to check is the disneyparksblog.com for all news regarding all Disney Parks.
Remember to "Let It Go" and have a magical time at the Disneyland Resort!
Sending you warm hugs on your pixie-dusted trip,
Lynette