Actually on my last few rereads I've been amazed at TT. The least of the trilogy, it's almost "quiet". But at the same time, there are some shining bits... the waterfall, the coneys, the Ents marching to war, Helm's Deep, the contest, the Sam-Gollum interplay, Aragorn shouldering more of his burden, Gandalf's miraculous return and Theoden's equally miraculous healing... and then the betrayal and horror at the end, and the tiny, faint hope that is all we are left with.
That's why hope was mentioned twice in the trailer, I think. Because in Two Towers, hope is all we have - but hope remains. And, as Sam said, "Where there's life, there's hope."
Do you think they are going to the place at the falls? - I remember seeing early pictures of the falls, but the trailer and the descriptions on the screencaps at the official site indicates they are going to Osgiliath.
JenB, well written, wise beyond your years.