I got my copy of Two Towers Complete Recordings today (I imported it as the UK release got delayed a little late toward the end of this month). The advance stereo track on the DVD-A disc is very good indeed, and 24bit 48khz as with Fellowship.... The choral material is mixed better this time round as well. It's certainly exhausting to listen through from beginning to end (there's just over 188minutes of score on this set) but it remains utterly compelling nevertheless.
What's fascinating about the Towers set in comparison to the Fellowship one is the sheer amount of material you've never heard before. Not only are various cues now in the thematic sequence Shore intended them to be heard before the final cut of the movie forced musical edits (Wraiths on Wings, Wolves of Isengard to name but two such tracks), but there's more material here put back that never made it into either the theatrical of extended DVD versions of the film. Gollum probing Sam about rabbit stew for example, it was in fact scored, but the music was never used, yet it's back in its rightful place on this release.
In many respects this is like hearing a complete different score to, obviously, the original 2002 album, but also as it is heard in the movie. At the very least it's like hearing the score for the very first time.