I have no concern with parents knowing the curriculum, but I have already voiced earlier why it is impossible to tell a parent exactly what their child will master, and hence we will move on to teaching, in minute detail at the start of each year / term, because I, as a teacher, can't predict how their child will respond to the teaching.
I name specific next step targets (e.g. use paragraphs in writing, spell all these words correctly, independently and consistently in their writing). But some skills have a progression in development and until step one is mastered there is no point in expecting the child to move to step two in the third week of term, or if they master step one and two in the first few lessons I can rapidly move on to steps three and maybe four. I have no crystal ball to 100% accurately predict this rate of progress, I cannot tell parents in advance what I will be actually teaching and what their child will actually succeed in learning. I'm not hiding information, I am not thinking parents can't understand a list of objectives, but the reason we train is to be able to react to the child each lesson and adapt the teaching not mindlessly follow a curriculum if it doesn't actually help the child.