To be clear, other motional frequencies are altered: because the intracavity lattice depth is modulated by the backaction this will affect certain types of atomic motion, for example the oscillation frequency of an atom about the bottom of one of the potential minima \cite{Horak00}.
(1) It should be somehow mentioned more clearly (maybe in the abstract) that the idea is not completely new but work presents a new and more intutive picture of the system dynamics.