Xoanon here,
Yes, it’s true, before I get a million and one emails concerning the casting announcements on AICN, I did know about these for the past couple of days, but was asked to wait until New Line was ready for their press release.
AICN says Cate Blanchett is Galadriel, Kevin Conway as Theoden and Brad Dourif Wormtongue, and Andy Serkis is the voice of Gollum.
More info coming soon!