From the glimpses of the character that have been seen so far in the clips and trailers Cage is playing this one with one leg in a loony bin. Which is excellent. Barmy Nic Cage is always a pleasure.
Official character description courtesy of Disney:
BALTHAZAR BLAKE (Nicolas Cage) is a student of Merlin and a Sorcerer. More than 1,000 years old, Balthazar has been searching the globe until he finds the Prime Merlinean, the descendent of Merlin and inheritor of his great powers. When Balthazar finally discovers him in 10-year-old Dave Stutler, he finds himself with a very reluctant sorcerer’s apprentice.