Here is another web site from a random school that states its acceleration policy based on MAP scores and additional information. This would be a useful outline on what to expect from your son's school, if they allow acceleration.
http://www.isd194.k12.mn.us/gifted/grade.pdfNow you just have to wait for the school to give you the MAP test results. I would personally hope that if the school is going to hold on to the data until it can present the results to you in a formal meeting, then it would be fair to expect the school to have 'a plan' to go with those results.