1)
Why did they say "ha'Yom"?
1.
Malbim: For what pertains to the day we must bless Hashem, who did not cease a Go'el from you. Your son is born in this baby; this is the foundation of Yibum. It is the Mes himself; he is your redeemer, that you will not die childless.
2)
What is "the Brachah v'Yikarei Shmo b'Yisrael"?
1.
Malbim: He will be one of the Gedolei Yisrael and men of renown.
