Pretty sure Leeloo already said she doesn't know of any dirt accumulation thats being worked on, so I think you're just reading a bit too far into it.
What if the rocks remaster means that there now will be more moveable props on maps? Like, imagine being able to crawl on an actually loose surface or making small stones fly with your "42 screamer tires.
I have noticed that in today's Automation changelog there are some BeamNG stuff, and it appears to be some food for thought
Something water realted is highly possible, but aerodynamics I don't think so, Tdev never really got around awnsering my question about it, and stated that they weren't working on it right now
It's just stuff that should have been in the exporter from the beginning and no idea why it wasn't, every vanilla car and normal mod has all of this (of course except the EV swaps and stuff)
It depends on channel size and update frequency, I think its several thousand subscribers, BeamNG as the primary or a primary topic of video uploads, and a upload relative to BeamNg at least like once every week, but this is just my assumptions based on what I was told, you would have to reach out to staff
I'd hope for the update to be released around 7 days from now, at least, to have time for the creators to record and edit the videos (because the amount of content we might have here) Also, it might not even be the FInal update of the Creator BRanch, in the Past it got at least 2 updates before release