Validity of "I will bless those who bless you"

A promise God made with Abram in Genesis 12:3 is being circulated around these days. "I will bless those who bless you etc." I understand that New Testament covenant replaces the Covenant between God and the Jews made with ***Moses***. (Hebrews 8:8-13) But to what extent? Part of it, or all of it? How has the New Testament covenant been understood to affect covenants made with ***Abraham***? (Not just concerning the land.) And how does the New Covenant, in the same manner, affect the other Old Testament covenants, like ***Noah's, Ishmael's, etc***.