Here's a few new highlights from SW.com's Hyperspace section of their site regarding Episode III:

Po Nudo will be returning wit his aide. The role is small.

Paul Davies will be playing an as-yet unnamed Mon Calamari character in Episode III.

Marty Wetherill will play Passel Argente again.

Mimi Daraphet returns as Jedi Bultar Swan.

Agen Kolar will be played by Tux Akindoyeni.

If you know who most of these people are without tracking them down with some research, be impressed ... or be very afraid.
Ich würde sagen das interessanteste wird der Mon Calamari sein, da die IMHO irgendwie ein Symbol der Rebellenallianz waren und wohl die OT und die PT miteinander verbinden wird.