Well, I'm not altogether certain myself. As I recall it, the moon retreats 1.5 inches away from the earth each year because of energy transferred from the earth's rotation. Beyond that, I don't know if the rate is varying or at which point it would break free from orbiting the earth. Perhaps someone who knows more could answer better.
PS. I just realized the leap dates wouldn't matter, since I gave a standard year date to begin with, which already accounts for them. So, scratch my last post!
What it seems to be is that the Earth is slowing down it's rotational speed, due to tidal drag, etc. But that energy goes somewhere, so the moons orbital velocity is slowly speeding up, an as it does, it goes into higher orbit.
Something like that. I could dig out Flamarrions.
But I ain't all that excited.