From www.theonering.net :

Mystery Towers Video Clip!
4/15/03, 8:58 am EST - Demosthenes

An anonymous spy dropped this little gem into our mailbox just yesterday. What is it? Well, it's a short video sequence of Gandalf chatting to Aragorn about the Ring in far more depth than we've seen previously. It could be from a Two Towers EE scene, a clip from the Two Towers PS2 game, or even a snippet from RoTK - we're not quite sure yet. SPOILERS!
Clip - 1.7 MB