Rats, overslept.
I'll go spoiler-free for now, since the demo was literally the opening minutes of the game.
To start with, you get to pick your own backstory through some of the opening dialogues, and they cover most of the major adventurer tropes, though there's also always the option when asked to just say "None of your business" and you can just keep it to being whatever you want their backstory to be in your head without the game insisting otherwise.
Some of the text adventure scenes aren't even multiple choice, they're just there to illustrate what's going on. And something I don't see anyone else mentioning is that they're slightly animated, and with sound effects added in. It really enhances the feeling of it, even if it's just a still picture of a waterskin being raised out of a river.
The game just looks, feels, and moves in a way that we all think the infinity engine games did, until we actually go back and play them. All the seams, the tiling, the same animations firing without variation over and over... It's all gone. the game looks organic and vibrant and alive, just gorgeous in every second of gameplay.
Allies can join, leave, or die at just about any time. When I left there were three members in the party, but Ropekid explained how with a few simple differences in choices up to this point it could be one companion or the other gone or even both.
There's tons of dialogue choices. One situation I saw had no less than five different skillchecks that could have resolved the situation, and a handful of "Normal" dialogue choices besides, each with their own personality indicators and influence degrees. They kept skipping through large chunks of dialogue, but I was able to read big chunks with Ropekid would stop to talk, and it's all pretty solid stuff from what I was actually able to process.
It's all just looking really, really, really well done, but I think from now on I can't actually read anything about it. Painful as it may be, I think I'm going to start my embargo before I learn too much more.
I'll leave you with one spoilery warning: Soul Winds will fuck you UP, son.