1)
How will Hashem wave His hand against them?
1.
Malbim: It will be via the four Charashim that will cast off their horns (3-4).
2)
What is the meaning of "v'Hayu Shalal l'Avdeihem"?
1.
Rashi: They will be spoils to Yisrael, who are now their slaves.
2.
Radak: The nations will be spoils to Yisrael, who were their slaves in Galus.
3)
How will you know that Hashem sent me?
1.
Radak: When this Nevu'ah comes. This will be in the days of Mashi'ach.