Yes I agree Elayne, and in this case I think "prolepsis" can be particularly suitable for those who want to use it, because I don't think we have a clear understanding of what the word means, so we might as well call it XYZ or "prolepsis"until we are ready to take a position to what it means to a common everyday english-speaker.
I think "anticipations" and "preconceptions" hint at the right direction, but only hint.