How do you see the Old covenant communicated as the New Testament hidden and the New Testament communicated as the Old Testament revealed
One of the places where the Catechism of the Catholic Church talks about this is in the section titled Law and Grace. Some highlights:
1964 The Old Law is a preparation for the Gospel. “The Law is a pedagogy and a prophecy of things to come.”17 It prophesies and presages the work of liberation from sin which will be fulfilled in Christ: it provides the New Testament with images, “types,” and symbols for expressing the life according to the Spirit. …]
1965 The New Law or the Law of the Gospel is the perfection here on earth of the divine law, natural and revealed. It is the work of Christ and is expressed particularly in the Sermon on the Mount. It is also the work of the Holy Spirit and through him it becomes the interior law of charity: “I will establish a New Covenant with the house of Israel… I will put my laws into their minds, and write them on their hearts, and I will be their God, and they shall be my people.”19 (459, 581, 715)
1966 The New Law is the grace of the Holy Spirit given to the faithful through faith in Christ. It works through charity; it uses the Sermon on the Mount to teach us what must be done and makes use of the sacraments to give us the grace to do it: (1999) …]
1967 The Law of the Gospel “fulfills,” refines, surpasses, and leads the Old Law to its perfection.21 …]
I see it as the Old Model T into the new Model Ford cars, both are Ford one is old and the other is more updated.