Double Drop

I haven't seen any news. The next general Double Drop should be Mid-late November for the game's release anniversary (the anniversary itself is Nov 20-22, I forget which day exactly, but the drops could be immediately before or immediately after). 

That said, they often do limited Double Drop events connected with specific releases or new raids or things like that. IF they plan to do one of those before the anniversary, it has to be very, very soon or you get too many double drops right close to each other. 

If I had to guess, I'd say that if there was going to be another DD before the anniversary, we'd know about it by now -- but that's only a guess, and the developers who know aren't talking.