EW.com looks at the ratings for War of the Damned and has an interesting paragraph at the end of the article:
Normally ratings for a final season of a series don’t matter too much. But in this case, Starz is weighing a spinoff centered on the Julius Caesar (Todd Lasance), who is introduced next week on the show. You can bet executives will closely follow how Spartacus performs this season — and whether Caesar seizes some fans of his own.