GBPUSD is reacting and pricing in the most important news aside from August NFP, heading into Major Monetary Policy meetings where the FED should be reigniting the bullish sentiment, BoE should be updating the public on BRExit negotiations from their perspective, and ECB at this point is on the side of unpredictable given the most recent dovish sentiment and publicly bashing the market strength in the Euro relative to the dovish statement.
As I digress I would love to believe that DXY bulls are preparing to pounce on better than expected market news, but the contingency relying on Janet Yellen, understandably, has the market on the wait and see approach. Logically, contingent upon Mrs. Yellen's perception, relative to currency pairs we could see a move to test the highs of 2017 before the potential favor of the USD manifests.