Generally speaking, those rotational programs are simply the first year of employment, not necessarily a temporary situation. Maybe you're talking about a different type of rotational program than what I'm used to seeing. The programs I know of include 1 year of rotational duties, then long-term employment at the same company after the rotations. (I mean, why would a company invest a whole year in somebody who is then going to turn around and leave?)
Is that significantly different from what your fiance is being offered?