What else would there be?
You need to remember this DLC was plainly stated to be the equivalent of the third versions, and what do THIRD VERSIONS mean in the world of nu-gamefreak?
1- Piss-easy battle facility that will not be able to fill the hole of a proper Frontier or PWT
2- A handful of new monsters (Slowpoke, Slowbro, The Regis, The bears, Calyrex, Slowking and the 3 birds already out-numbers the Pokemon added in USUM, so don't expect any more)
3- A way to capture all old legends (Tundra DLC covers that)
4- Shitty new story with shitty characters that can be done in 4 hours at most.
And we already know all of those things are in the DLC, so you can safely assume we know everything already.