Here are my predictions for his Zetas:
Emperor of the Galactic Empire: Empire and Sith allies gain +50% Potency and Max Health and Light Side enemies have -50% Potency and Evasion. Whenever an Empire ally inflicts a detrimental effect during their turn they gain 30% Turn Meter. Whenever a Sith ally inflicts a detrimental effect during their turn they recover 30% of their Max Health. Dark Side allies also have 75% Offense against Light Side enemies.
Crackling Doom: At the end of his turns, Palpatine deals special damage to all Shocked enemies and then deals Special damage to all Light Side enemies and Shock them for 2 turns. Whenever each Shocked enemies takes damage, Dark side allies has 40% chance to reduce all cooldowns by 1. This damage can't defeat enemies.
So my theory is that anyone who opposes the Galactic Empire, shall be dealt with. I know it sounds crazy but we'll let the devs decide.