1)
Why will they discuss [only or primarily] the final redemption?
1.
Malbim: It will be greater, for three reasons. (a) It will be from the north and all lands; Yetzi'as Mitzrayim was from one land. (b) The sins for which we were exiled among the kingdoms were greater. If a son rebelled and his father expelled him from his house, it is hard for him to return. (c) At Yetzi'as Mitzrayim, Eretz Yisrael did not yet belongs to Yisrael. Now, they already merited the land and inherited it; there is a greater Simchah to return to their land.
2)
Who was Medi'ach Yisrael?
1.
Radak: The kings of the nations, who exiled them.
2.
Malbim: Hashem expelled them.
