I will be watching Batman: Year One after I buy it from a store once it's officially released on October 18th.
I like what I've heard of Ben McKenzie's young Bruce Wayne/Batman and the others voices from the preview, trailer and clips.
Here is the full Batman: Year One voice cast:
Bryan Cranston (Breaking Bad) is Police Lieutenant James Gordon.
Ben McKenzie (Southland) is young Bruce Wayne/Batman.
Jeff Bennett (Alfred Pennyworth on the "Downtime" episode of Young Justice) is Alfred in Batman: Year One.
Fred Tatasciore (9) is corrupt Police Detective Arnold Flass.
Jon Polito (Miller's Crossing) is corrupt Police Commissioner Gill Loeb.
Stephen Root (No Country For Old Men) is corrupt Police Officer Brendon, the head of Gotham's SWAT team.
Nick Jameson (Red (2009)) is Police Officer Merkel, a rookie patrolman.
Eliza Dushku (Tru Calling) is Selina Kyle/Catwoman.
16 year old Liliana Mumy (The Cleaner) is Holly.
Steve Blum (Hulk vs. Wolverine) is Stan the pimp.
Alex Rocco (The Godfather) is crime lord the Roman/Carmine Falcone.
Katee Sackhoff (CSI) is Police Detective Sarah Essen.
Grey DeLisle (The Flintstones: On the Rocks) is James Gordon's wife Barbara Gordon.
Robin Atkin Downes (The Starter Wife (TV series)) is District Attorney Harvey Dent.
Keith Ferguson (G.I. Joe: Renegades) is drug dealer Jefferson Skeevers.
Sara Ballantine (Spider-Man (1994-1998 animated TV series)) is Skeevers' Attorney.
Danny Jacobs (The Penguins of Madagascar) is Flass' Attorney.
Roark Critchlow (Afterworld) is the Hare Krishna at the train station.
Pat Musick (The Tick (1994-1996 animated TV series)) is the Roman's wife.
Andrea Romano (Batman: Year One voice director) is the medical Obstetrician for Barbara Gordon's pregnancy.
Bruce Timm (Batman: Year One producer) is thug #1.
James Patrick Stuart (Andy Richter Controls the Universe) is a henchman.
Michael Gough (Totally Spies) is a driver.
Bruce Wingert is a guard.
Here are more stills from the film: