Its called market wisdom. Markets dont wait to price something in until the very last trader has understood whats going on. They start way ahead of the actual news...
So then, it's plausible that our dumper friend is inside to these ETF's and has learned that they'll (Wink) not be approved?
Haha! Nice interpretation.
I expect Winklevoss to come out with some sort of announcement at Nov/Dez. I remember to have read some interview with some Wallstreetguy who said that he expect results about the ETF in 2014.
Markets usually start to price in news way before the event itself. So that would lead to sep/oct/nov as some nice pre-movement.