If Zhonya saves a buffed unit from death, does the unit retain its buffs?

Ruling: Yes, the buffed unit retains its buffs when saved by Zhonya.

Nuances:

• Units only lose temporary characteristics (buffs, "this turn" effects, etc.) when they change zones
• Zhonya preventing death means the unit never actually changed zones (didn't go to trash, hand, or banish)