I don't consider myself a Bernanke fan, but my understanding is that he is an expert on the Great Depression and that his conclusion has been that deflation is the worst possible problem -- and that FDR failed to sufficiently inflate the money supply to combat deflation. As far as I can see, Bernanke is pushing hard in the direction of inflation and hoping that he can thereby achieve stability (deflation and inflation canceling each other).
I don't know if it's possible, but it seems like this is what he's trying -- so we have signs of deflation and inflation simultaneously.