  Jeffrey's rule has been generalized by Wagner to the case in which new
evidence bounds the possible revisions of a prior probability below by a
Dempsterian lower probability. Classical probability kinematics arises within
this generalization as the special case in which the evidentiary focal elements
of the bounding lower probability are pairwise disjoint. We discuss a twofold
extension of this generalization, first allowing the lower bound to be any
two-monotone capacity and then allowing the prior to be a lower envelope.
