Here's a thought I just had though.
We've seen pretty much every Jedi or Sith in Star Wars fight with a lightsaber in these movies...Yoda, Anakin, Qui Gon, Obi Wan, Darth Maul, Darth Tyranus/Count Dooku, Mace Windu, Luke...
Is there a chance in hell of seeing Darth Sideous/Emperor Palpateen fight with a lightsaber in Revenge of the Sith?
...maybe that's how the Mace Windu character dies...he looses a battle with Sideous.