I'm in the standing museum pose camp as well.
I just hope they make him standing on dry land (maybe with waves crashing or something) and not as if he's underwater. He's going on a shelf, not in my aquarium. Ha.
I'm guessing classic head/hair with a modern long hair/bear switchout.
Just make him pretty. Aquaman should be HOT!
I hope we get classic Mera too, but I guess that's doubtful now.