So Larian have now commentated on the claims about "cut content" and things found through datamining. Specifically on Karlach, epilogues and the upper city, but also generally about why things are changed.
The upshot is that things that are just a bit broken will be patched, endings will be expanded in time, but huge swathes of the game that people claim were just removed aren't going to suddenly appear, because they never existed.
