You can't actually see the map that well in the pics, and I have yet to see it in person, but I'm willing to bet that all that level 1 elevation in the first map turns into level 2 elevation in the second map of Wayne Manor and that the Bat Cave becomes level 1 elevation.

So truly everyone is falling up!

So, out of curiosity, why is there no official ruling on this official, and rather prominent, scenario rule?

Is it just that it's currently under discussion between the rules deputies/RA/design, or should we expect to not ever see an official ruling?

You have seen the official ruling. It is what I said above.
Your first statement is in error. There is no official scenario, thus there is no official scenario rule. All you have is a suggested scenario which you may interpret however you wish.

But how is an ability on an official map different than that on an official character clix?

The "Quake" rule is not on the map. It is printed on the materials that accompany the OP kit.

It's on the first map of the prison that I have. A nice orange paragraph in the corner. I think it also covers the catwalk of that map as well.

Edit- I'm probably wrong on this as I don't have the map with me and am going from memory.

That orange text ONLY covers the catwalk.

As I said above, the Quake rules are not official in any way. They are merely a suggestion of something that venues may do if the venue feels it will enhance the experience, but how the rule is implemented, if it is at all, is up to the venue.

You will never see this Quake map rule in the PG.

You have the official answer. The official answer to all questions regarding the suggested Quake mechanic is exactly what I've been saying...it is up to the judge and venue to decide.