My problem with Karlach was that the story was incomplete, not that there was no happy end (although it does clash somewhat with D&D lore).
I do hope that Laruan did not just cave to the shippers and add a cheesy happy end but instead stay true to their vision and instead add a better lead up to the ending.
That would imply that had a coherent vision and not just a "uh, we're in a hurry here, we need to drop some things"
