No: as a movie, it looks ok, possibly quite good.
As an adaptation of the book, it looks ridiculous. The book doesn’t talk very much at all about what happens in Terabithia – and there is certainly no indication that their imaginations populate it to the degree shown in the trailers for the film. Looks like they are moving it completely out of the family-centred story, which is what the book is all about – her family being different from his and how you live with yours – into the fantastic.
This might make for a good film, but it’s negating everything that makes it such a classic.
Of course, that might just be the trailer… but I doubt it.