There really hasn't been much shown or talked about to the general public. Most of the places only discuss what you've said about third act and etc, but on this article:

https://www.usgamer.net/articles/di...-arx-story-chapter-easy-mode-for-newbies

On the very last paragraph "Larian Studios will be releasing a detailed list of all the changes to Kickstarter backers "some time before E3", according to a developer USgamer spoke with. The list of changes is apparently 45 pages long in Larian's internal documentation, so expect that novella sometime soon."

So e3 has already happened, does that mean the backers already got it? I mean if they have and the general public hasn't seen anything so maybe they aren't allowed or something, im not sure. BUT if it is 45 pages long or so, that's a HUGEEEE list with tons of changes.