In middle school and high school, students take courses called algebra, geometry, algebra 2, calculus, etc. This is true not only in MCPS, but in school systems all around the country. Parents who are interested in math education in MCPS are certainly aware of what courses are available in middle school and high school by 5th grade, if not sooner. My goal for my children is that they take AP calculus by 12th grade, or possibly 11th. The goal may change, but that's what I'm thinking now, and I don't think it's top secret or scary information.
If high school math MCPS courses are irrelevant to you or if your children are young and you have not thought about high school math courses, then, yes, the question is irrelevant to you. I'm sure other parents have thought about what high school math courses they think their children should be taking or what they're capable of taking.
I'm concerned that algebra, geometry, algebra 2 and calculus will have the same names but will not cover the material in as thorough or rigorous a manner as better school systems. I've seen how MCPS places lofty names on very basic, preschool level, math exercises at the elementary school. If the same people designing 2.0 for ES are responsible for changes to the high school math classes then the course names will not matter. The courses will be as remedial as the ES ones and not prepare the kids for math careers or math at university beyond a community college.