I'm gonna have to say I don't believe the Grima killing of Saruman scene is accurate, mainly because it takes place at Orthanc. At 4 hours+ Jackson just can't leave out the scourging of the Shire and that is where Saruman dies. Changing it to Orthanc just takes way too much liberty with the story and so far, thankfully, Jackson has shown too much respect for it to make such an eggregious change.
My two cents for what they're worth ~
Nice sentiment, but I am quite sure that the Scouring of the Shire is definately still out....
Hmmmm, well, the 4hr 20min thing has been debunked from some pretty high up people that contacted TORN today. There are still reshoots going on in New Zealand, so nobody really knows how long the final version will be. My guess is about 3 and a half hours.
I think the Saruman death at Isengard is for real, there were times when I wasn't sure, but now I feel certain, and having seen a pic of Wormtonge on top of Orthanc with a dagger....well, that confirmed it for me.
I think it might surprise everyone and be a pretty good scene, the part I'm worried about is Legolas' "magic arrow theory" (to coin a phrase), which kills Wormtongue...it just sounds too comic for such a serious moment, but who knows.