Hi there Cassandra!
While Fantasyland gets a little bit of an
addition (ok, it's going to be unbelievable!), all of the characters will be relocated to various parts of the Walt Disney World Resort. Here is another link to the
Official Disney Parks Blog which talks about where the Faries and Tinkerbell are going to be moving to. So according to the blog, Tink will have a meet and greet area in Hollywood Studios following the closing of Toontown on February 11th. The rest of her Fairy friends are going to be joining her in the Spring in Epcot for the Flower and Garden Festival. Specific dates on when they will arrive to frolic in the flowers have not been released.
Princess Tiana and Prince Naveen can typically be found at their Meet and Greet location at the Liberty Square Bridge intermittently from 10am - 4.45pm. As always, make sure to check the Times Guide at Magic Kingdom for character appearance locations, parade, and show times. If you cannot find the character you are searching for, go by Guest services and ask a cast member if they can call the "Character Hotline". Hopefully, they will let you know where they might be located. I hope you and your family have a Magical Time at the Walt Disney World Resort! Thanks so much for asking the Moms Panel!