The Vatican generally waits 75 years before releasing documents. So we are waiting on documents from 1939 at this point (with the exception of the 11 volumes of the Acts and Documents of the Holy See Relative to the Second World War, or ADSS). What documents were not chosen for that collection is a matter of some debate, and we will soon know the realities of what remains to come to light. (This is for Vatican definitions of the word "soon")