Large 3-way Call Spread in GLD

It looks like someone is taking advantage of today's rise in the SPDR Gold Shares GLD and unwinding a long August 160-175 call spreading 15k times and using the proceeds to continue a Bullish sentiment with the purchase of 30k September 172 calls. The August spread was sold for $1.00 with the September contracts purchased at $.70. The last time GLD traded above the $172 price level was late February 2012.