Here's what FRB NY's Dudley said this week - from Reuters article:
"Dudley argued that the Fed's large and growing balance sheet is nothing that prevents the Fed from controlling inflation once the economy corrects. 'It is not the case that our expanded balance sheet will inevitably prove inflationary,' he said.
Specifically, Dudley said the Fed's new ability to pay interest on excess reserves is a critical tool it uses to keep banks from lending these reserves and thereby creating new credit and boosting inflation. 'Thus, through the IOER rate (interest on excess reserves), the Federal Reserve can effectively retain control of monetary policy,' he said, noting that the Fed can increase the IOER rate if banks begin to find it more profitable to lend these reserves."