Well...
I've discovered that while there's no proper changelog, the download comes with a .pdf called "Reference Process", and looking at that thing gives you a good idea of what's new in the game if you compare it with what was present in the previous versions.
From what I've seen, there's more Loki stuff, a couple of new defeat events, an expansion of the whore-house events and some stuff where Lenneth could actually be fucked in a different outfit, at least in one defeat scene. Something about swimsuits too.
No further progress on Jiao's route. No further progress on Lilim's route. No progress at all on Thor's route. No other methods to increase Fallen Level except through Loki's events.
By the looks of things, the dev intends to finish Loki's route first, and then work on the others. I suspect that the only reason why the starts of the others are even included at this point is because things only seriously branch out after rescuing Odin depending on a number of choices that are made up to that point. Also, it seems like pursuing a pure ending with Thor will basically be super-hard mode if you do it on the first playthrough... Loki's and Lilim's route seem to be normal difficulty, while Jiao's route will basically be easy mode on account of busted Jiao is as a bond partner.