If a unit is saved from death by Zhonya's Hourglass, does it lose spell buffs like Discipline and Enrage?

Ruling: No, the unit does not lose its buffs. When Zhonya's Hourglass activates, the unit is recalled rather than dying, so "until end of turn" effects like Discipline and Enrage are preserved.

Nuances:

• The unit doesn't actually die and get revived; it never dies in the first place due to the recall effect