They're a different species than the more commonly seen Aussie
Scolymia australis or Indo
Parascolymia vitiensis. Veron had no idea what the actual species was, but confirmed they weren't formally described to his knowledge.
They haven't been seen in nature much bigger than a quarter, and none have been in captivity long enough to determine full grown size [to my knowledge], so I suspect they'll stay dwarfed by
S. australis.
For what it's worth they
do not get along with other species of Scolymia.
Cherry Corals has some really cool one's I saw the other day.