The saber to the hand effect is probably a little bit of interpolation, some normal Visual Effects (comp effects) and probably just a device out of the camera's range...all speculation, looks cool as sh!t though.
Anyway, looks to good to be a reverse shot, unless they spent that much time trying to get it to look right in a scene.
THE SABERS:
Dooku pulls the blue saber from Anakins severed arm.
--This is Obi-Wan's replacement saber, as he received it after they took his away in the ARENA. Anakin's is Green and he was Force thrown the other one by Obi-Wan.
So Dooku is using Obi-Wan's temporary replacement that Anakin used when he went Akimbo (two weapons).
I can tell this from the pics I've seen from the VD, and other books:
Dooku gets the RED SABER KNOCKED AWAY in the original cut, and uses the Blue saber, then he does the pilar(sp?) thing to get away.
BTW, in the original cut, we don't get to see Yoda absorb the lightning, in fact no lightning use at all; Yoda just pops in and ignites his saber and blocks some blows from Dooku...then he says Much to learn you have, etc. and Dooku goes akimbo, etc.
Cool, but the final cut is still sweet IMO, and you can tell they did that at the last minute--not like it looked bad, but all (correct me if I'm wrong) books are wrong on the fight.