I'm picking up here and there that the rosary's new mysteries celebrate or give it a deeper Christological focus.

No, No, No, No, NO!!!

Mary is what brings about true depth inChristology or in understanding the Trinity for that matter. It is a contradiction, maybe a paradox, or something, but the truth is that you have to focus on Mary to get the real depth of Christ. Try it, I promise you, it works!