I’m pretty sure this will be the only hover car we see. There could be a chance of this getting updated but chances are usually slim.
There's already a mod for the pigeon that turns it into a plane. --- Post updated --- https://www.beamng.com/resources/pigeon-mod-pack.1642/update?update=4721
It's a very outdated mod. Bernd hasn't be very active lately, so it's unknown if we'll ever see it get updated. I don't think you really bumped the thread. I could be wrong though.