Revelation Song (never gets old)

What is the new song?

Psalm 40:3
And he hath put a new song in my mouth, even praise unto our God: many shall see it, and fear, and shall trust in the Lord.

Psalm 98:1
O sing unto the Lord a new song; for he hath done marvellous things: his right hand, and his holy arm, hath gotten him the victory.