This is one of those things that has always bothered me, apart from being told that the locals are entirely unfriendly, and that the fauna and flora is extremely dangerous, we have very little information regarding the southern continent.

Don't get me wrong, I love the mystery surrounding the place, and given what we did in terms of freeing Tiamat (Along with a certain speech at the end of Endwalker) we can determine we will see it soon enough.

We know about the Centaurs, the plant-based creatures, and likely two broods of Dragons (Bahamut and Tiamat). However, we don't actually have any information regarding the playable races which make it home. Not including the thralls of Sophia, however we might have an idea of what actually lives there.

See, one of the things which was made clear is that the Allagans claimed a substantial portion of the Southern continent, and given that every time we poke around in those ruins we wake something up, it's quite possible there are still dormant Allagan relics awaiting full activation.