Theres another Rumored "working" title for episode 3. It's in an 'Art of star wars' book and several references from people in the film. Coicedence(?) tat its close to an old film with Peter Cushing(Tarkin),Chris Lee(Dooku) and Ian Mcnormand(Palpatine)-"The Creeping Flesh"
Grievous!
Star Wars Episode III " The Creeping Fear"...
...."And the galactic guardians cloistered in the Jedi Temple are feeling the creeping fear -- the growing power of the dark side."