listening to the directors' commentary on the two towers dvd, I believe pj mentions that they had to nick a bit of saruman on the balcony from the voice of sarumans scenes, to use in the bit where we see isengard flooded, as pj didn't realise he would have a flooding scene, and it was too late to use christopher lee in pickups.
In other words, I think saruman will be on the balcony.
PS on a tangent regarding the commentary, isn't Phillipa Boyens a bitter woman in the controversy she has helped cause with the changes to TT? At least Fran Walsh admits they've made some drastic changes that tolkienists won't like, but PB keeps going on about how they were neccesarry. especially in the helms deep scene where we see eomer instead of erkenbrand. she was insinuating that that change was worse than the faramir changes but no one really moaned about it!
Hillarious!