Instead of facing the droid army on Geonosis, the jedi on Genosis face the combined forces of Isengard. Count Dooku grows his hair out and becomes Saruman. No clone army is coming. Yoda is not present. Jango is replaced by the roving band of Uruk Hai that killed Boromir.
Saruman: Brave but foolish, my old jedi friend. You're impossibly outnumbered.
Mace Windu: I don't think so.
Saruman: We'll see.