It's really difficult to know how our school district will implement CC math. I went to a district meeting open to parents about that recently, and I don't think they exactly know what they will do.
We have a very good public school system in a university town. Most kids take pre-Algebra in 7th grade and Algebra in 8th grade. Kids who are in the gifted program, or test into it, take Algebra in 7th grade.
It sounds like CC will get rid of that but our school district hasn't come out and said that yet. Sigh! My son is highly gifted in math and is 5th grade.