I hope Titan comes and posts specifics about this. While kernel-power might work with PR 1.3 there are no guarantees that it has the same bugfixes that PR 1.3 has, so it could still cause problems later on.

However when PR 1.2 came out he mentioned that in fact kernel-power had been compiled from the PR 1.2 kernel source long before PR 1.2 even came out. It may be the same now with PR 1.3 but without confirmation its impossible to know either way.