The NIV is nothing new, being published in 1978 the “bible” is based on the Greek text of none other than Nestle-Aland Greek New Testament and as I understand it the Old Testament comes from the following:
The Masoretic Text
The Dead Sea scrolls
The Samaritan Pentateuch
The Latin Vulgate
The Syriac Peshitta
The Aramic Targums
and Psalms comes from Juxta Hebraica of Jerome.
What a total and complete mix.
When The Christian Reformed Church and that National Associations of Evangelicals came together for a meeting at the Trinity Christian College at Palos Heights, Illinions, USA in 1965 the New International Version came into being. In the meeting were also international scholars.
The New York Bible Society did the translation.
The Biblia Hebraica was also used on “The Scriptures” and the New Living Translation.