The Hobbit (2011 - 2012)
For a two-film series shot back to back, they should be news about casting soon. Here's a recent blurb:
On 17 July 2009, The Daily Telegraph reported that David Tennant is being tipped to play Bilbo Baggins. The Doctor Who star leads a list of other actors, including James McAvoy and Daniel Radcliffe, who have also been linked to the role.
Young Bilbo is the most crucial role to be cast. Besides those names, I'd like to throw in Tom Hollander from the Pirates Of The Caribbean sequels, for his resemblance to a young Ian Holm.