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In my idealistic world, no one dies. However, that would be lazy and unimpressive storytelling. It's a war. Both sides lose people. Anything else wouldn't be believable. Anyone who isn't around at the end of the prequels could face the guillotine. I'm just guessing, but I wouldn't be surprised if we see Satine go this season. And maybe Savage.
And as far as Ahsoka's fate, well, make sure you wait and see. On the red carpet for the premiere at Celebration VI, Ashley Eckstein said to watch until the very last moment this season... so make sure you use the restroom and have all your snacks ready before you sit down to watch the finale.
Who do you think will fall in season five?