The new chief of the Federal Housing Finance Board brings an impressive résumé to the GSE regulator, but it’s unlikely that the appointment of Ronald Rosenfeld will change any plans to replace the FHFB with a new oversight agency. “I believe that there will be a new [regulatory] structure put in place this year,” said one GSE observer, who asked not to be named. “I think the [Finance Board] is better. I think the examination…