I've heard that too, that it will be harder to accelerate kids in math with the Common Core.
Currently my son, our in local public school gifted program, would take 7th grade Algebra I, 8th grade Geometry, 9th grade Algebra II (I think that's what that it), 10th grade Pre-Calculus, 11th grade AP AB Calculus, 12th grade AP BC Calculus. Plus they have AP statistics too.