Name who you think should play each part!
Bilbo Baggins: Elijah Wood
King Thranduiel: Orlando Bloom
Director: Peter Jackson
Gloin: That one dude who played Gimli?
Heh.. it'd be funny if all the LotR cast ended up playing their ancestors in The Hobbit, but unfortunately it probably wont happen..
EDIT -
The Elves, Elrond etc, and the Wizards, Gandalf and Saruman, should obviously be their actors from LotR, as they won't have aged significatly over the 100 years or so.
If anyone has IMDbPro,
click.