1)
Whom does this verse discuss?
1.
Malbim: It is those who came to dwell temporarily in Egypt, and return to Yehudah.
2)
Who will escape?
1.
Rashi (from Seder Olam 26): Yirmeyah and Baruch returned when he conquered Egypt in his 27th year.
3)
Why will only a tiny remnant return?
1.
Malbim: Even though they do not fight, they will die via hunger and plague.