Here is a discription from last year. May not be exactly the same due to budget cuts
http://www.go2orlando.com/top/1,1419,G-Go2Orlando-AttractionsArticles-X!ArticleDetail-2227,00.html
The Wicked Grinch himself, the whimsical town of Whoville and all its off-kilter residents come to Seussian life with this year's whimsical, Wholiday celebration at Universal Studios, Islands of Adventure
The whimsical Seuss Landing, at Universal Studios' will be transformed into Whoville itself, outfitted with appropriately Whovian holiday decorations. A parade complete with sneak attack gift snatching (a favorite Grinch pastime) will cross the island several times daily while acrobatic Seussian street performers balance stacks of holiday gift packages beneath snow-capped Truffela trees. Guests will hear caroling Whovillians while frolicing in real snow or meet the Grinch himself and his little dog, Max.
This brand new Wholiday celebration called "Grinchmas," is in conjunction with the opening of Imagine Entertainment's, "Dr. Seuss:' How The Grinch Stole Christmas," starring Jim Carrey.
Grinchmas takes the delightfully off-kilter residents of Dr. Seuss' Whoville off the screen and brings them to life. From freak snowstorms on Mt. Crumpit to Whovillians, Who pudding, Who singing, and who knows what else, Grinchmas will continue through December 31. There will be nightly processions, singing and dancing Whovillians, a nightly tree-lighting ceremony.