My understanding is that the Orthodox Study Bible OT will essentially be the NKJV, with a few changes made here and there accounting for significant differences between the MT and LXX. Unfortunately we do not have enough english-speaking Orthodox Biblical Scholars to undertake a proper translation project to provide a scholarly and critical text and translation; for while I believe our OT professor at Holy Cross, Fr. Pentiuc, would be capable of undertaking such a scholarly endeavour, he is the only Orthodox Biblical Scholar I'm familiar with who seems to be (though admitedly, I am not familiar with all the scholarly publications of all the Biblical Studies Professors at the Metropolia's Schools). Unfortunately, Orthodox Scholars, in general (at least in America), tend to be of a lower caliber than their Protestant or Roman Catholic Counterparts, with a few notable exceptions.