Reports indicate our president has before him two (and perhaps more) outstanding candidates to lead the Federal Reserve when Ben Bernanke's term ends early next year—Larry Summers and Janet Yellen.
These two capable contenders aren't likely to have wildly different positions on the dove/hawk spectrum, though Summers is seen as the greater hawk of the two. Though even these apparent differences are likely to have been exaggerated by the financial press as Summers has been a consistent advocate for erring on the side of engaging in more, rather than less, stimulus on both the monetary and fiscal sides.
To me, the differences between the two on the policy questions before the Fed are likely to be slight. (Related: The Fed Candidates)