This is what the Lord says—
    the Redeemer and Holy One of Israel—
to him who was despised and abhorred by the nation,
    to the servant of rulers:
“Kings will see you and stand up,
    princes will see and bow down,
because of the Lord, who is faithful,
    the Holy One of Israel, who has chosen you.”

As we have previously noted the universe standing up in God’s presence, so we now see ”Kings” standing in the presence of Christ.

To my mind, this passage is resonant with the introduction to the fourth and final ‘Servant Song (52:12-15), with its message of a great reversal for the rejected (crucified) suffering Servant:

See, my servant will act wisely;
    he will be raised and lifted up and highly exalted.
14 Just as there were many who were appalled at him—
    his appearance was so disfigured beyond that of any human being
    and his form marred beyond human likeness—
15 so he will sprinkle many nations,
    and kings will shut their mouths because of him.
For what they were not told, they will see,
    and what they have not heard, they will understand.

Isaiah 49:7 reads like this in ‘The Message’:

God, Redeemer of Israel, The Holy of Israel,
    says to the despised one, kicked around by the nations,
    slave labor to the ruling class:
“Kings will see, get to their feet—the princes, too—
    and then fall on their faces in homage
Because of God, who has faithfully kept his word,
    The Holy of Israel, who has chosen you.”

I have regularly recommended Tom Hale’s excellent Old and New Testament commentaries. I’m quoting him again today because I think this is excellent:

‘Here the Lord addresses His servant, the Messiah, one who was despised and abhorred by the nation (Israel). Here we get our first suggestion that the Messiah would be rejected by His own people – which, of course, turned out to be true. He is called the servant of rulers; Jesus was subject to earthly rulers, such as Herod and the Roman emperor. But in the end, the rulers of the world will rise up in respect and bow down in submission before God’s servant, the King of kings and Lord of lords. This has yet to come true but one day it surely will, because God has chosen His servant and God is faithful to His word (see Philippians 2:9-11).’ Applied Old Testament Commentary’, p.1050.