I've been seeing a lot of people here, when discussing Chronicle, start yelling out "RETCON RETCON RETCON" at every new piece of lore we get. Just because we now understand how things happened and learn information we had no clue on before, doesn't count it as this negative retcon. The only thing I've found to be a retcon is *SPOILERS?* The story of Aegwyn *END SPOILERS*.
Blizzard is allowed to explain things and fill in blanks.