So I think there is something cooking up - Patch 2 was relesed os September 3, and the interview was relesed september 8th, and Swen said about Karlach:
"We said okay, let�s give an updated ending.
An optional ending, because they are all the other ones for Karlach."

And that was in My opinion about Patch 2 content they added.

But then he said:

"So we are adding in extra epilogue stuff. It�s actually underway." - that is said after releasing Patch 2 epilog stuff, so I think They might actualy doing something

By looking how this thread grows, and Larian being known to listen to community - I have good feeling