I'm really looking forward to this movie. The Battle at Red Cliff is one of the most famous battle in China's history, and the characters are all legendary, so to see them on the big screen will be a real treat to see. If Woo can pull this off, we'd have a Chinese LOTR due to its epic storytelling and amazing battles.
Btw, it's unfortunate that Chow pulled out (and decided to do Dragonball instead *mind boggles*), but Tony Leung is an excellent replacement and I'm sure he'd do a fantastic job.