1. Seeing those Orcoid figures, people did speculate that we are getting an orc retcon. I wonder, will there be any 'lore touchups' to the already existing races? Here I do not mean updates of things we don't know, but more like modifications/slight changes into how the races are presented.
Who knows.
I've not really seen much evidence that they have been unhappy with their portrayal of different races necessitating any alterations.
I'm sure Ixal believes that they will humanize their races a lot more in order to make them more "Pretty" so they can push sex (To which the more human looking Orc figures in the trailer is evidence for such humanization). But at this point we don't really have any hints.
2. Do you think the game world will keep it's insular character, only having known geography as references, or might we witness a first effort of 'unraveling' the Rivellon world map?
It's possible that we might start to get a world map. If the idea is that this is the "Biggest and deepest game yet" it's possible that this will include a number of locations to visit and thus some sort of map to enable traversal between said locations.
3. I was okay with DnD personality skills, but I loved the hints of DoS 2's 'different styles associated with each attribute'. What direction do you think Divinity will take how Personality works?
I'd expect them to continue with DOS2 style. Given their apparent dislike of D&D, I'm not sure I'd expect to see any D&D mechanics make an appearance.
I'd hope that they might take some inspiration from Pillars of Eternity though. It had a pretty nice personality system which provided a number of interesting dialogue options and character interactions based on your personality (Determined by which personality driven dialogue options you favoured)
4. It is just me, but I always wanted to see a future Div game where either your background or, even better, a combination of your background traits creates a radiant personal quest --> thus, a custom char can essentially be an origin char. Would you prefer this level of randomness/plasticity, or fixed stories are better?
Not going to happen.
The custom character is intentionally the blankest blank slate that ever blanked slated. This is to cater to the people who want to fully headcanon their entire character and their interactions in the game. So they will keep it completely blank and devoid of any and all connection to the actual world.
The best that can be hoped for, for any of us that prefer having a character who actually fits into the world and story at all, is for at least 1 unique Origin. Similar to how the Durge in BG3 is a unique Origin and has a whole storyline and isn't just a companion whom you can experience 90% of their entire story from just having as a companion.
We just have to hope that any such Origin is more palateble than Durge. Ideally, we'd get multiple unique Origins allowing us to get a range of characters, which would help alleviate any issues with any particular Origin having a story someone might not be a fan of.