Yellen might focus on medium and long-term issues
From Bank of America Merrill Lynch:
The key new information that the rates and FX markets will receive this week will be through the Fed’s economic symposium in Jackson Hole. The theme of this year
 It is likely that the Fed will want to preserve the option of a December rate hike and believe the market should continue to assign roughly 50% odds of a rate hike by the end of this year, which remains our economist’s expectation for the timing of the Fed’s next move.