I may be reading more into this than is there, but here is what I've spotted from today's watchtower study (Oct 2016 study edition) page 14 paragraph 8. Concerning Daniel it says "Thus, some 70 years after his arrival in Babylon, he was still known by his Hebrew name" referring to an event in the first year of Darius ie 539/538 BCE. However, according to the WTBTS chronology Daniel went to Babylon in 617 BCE - more like 80 years earlier. Could this (finally) be a step towards ditching 607?
SF