I hope Larian write directly what exactly you changed in the plot, and do not invite players to search and look for it personally "to maintain interest in the game." This will make it easier to test and collect feedback.
Same. Although, with a balance to be found. They could say "we changed the way Minthara recruits you", though they perhaps should not say everything about what exactly they changed in that area of the story. There is some value in letting people play "as if for real", since that is how most people will play on full release. But I feel the time for "here's the whole game, we don't tell you anything about our plans, please give whatever feedback you want" is past, and now is the time for " hey, we changed this mechanism, please let us know how this works" and "we definitely plan to add this feature but certainly not in the near future"