Here are a couple of article I got from googling about Acceleration and Common Core.

http://math.dpi.wi.gov/files/cal/CCSSM-Talking-Points.pages_.pdf [5pg pdf]

http://www.doe.mass.edu/candi/commoncore/MakingDecisions.pdf [3pg pdf]

It seems that acceleration is certainly possible in Common Core, but it should be done with compacting rather than skipping, so states and districts have to design such a compaction plan properly (not so hard, just cover all the material, just faster). Many states and districts will use Common Core as an excuse to stop acceleration, but it seems it is not a legitimate excuse.