Colossians 1:27 describes the mystery as "Christ in you, the hope of…" what?

Answer: Glory

God made known among the Gentiles the riches of this mystery, "which is Christ in you, the hope of glory."

“To them God has chosen to make known among the Gentiles the glorious riches of this mystery, which is Christ in you, the hope of glory.”— Colossians 1:27 (BSB)