The first version of this is available in the beta channel. Tapping on "Edited ... Apr 5 at 23:01" (or equivalent) will take you to a screen like this:
Tapping an individual revision will get you something that looks like this:
I've still got to polish it up a bit and will probably add a side-by-side view but not markdown (because the API does not yet support it). The comparison is running client side so there may be differences in the highlighted changes for performance reasons.
And in case you're wondering, deuterium's nucleus is a boson, the atom is a fermion, the molecule is a boson, and I apparently should have been paying better attention in PHY 361 because I had no idea that bosons or fermions were composed of other particles.