Black Knight Financial Services says at least 7.4 million mortgages should refinance, due to where rates are today and looking at borrowers with current notes at 4.5% and above. This may also be a good time to refi into a conventional mortgage if you have an FHA mortgage with a rate in 3% range with expensive FHA mortgage insurance.
Last week the Fed formally wrapped up their aggressive buying of mortgage backed securities (QE) which helped to keep mortgage rates at such a low level over the past couple of years. This was not a surprise to the markets as the Fed had continuously reiterated their plans to end QE in October. Mortgage rates seem to be slowly trending higher.