I have to agree about the article leaving a bad taste. Its also why I'm kind of giving up hope right now - I don't expect them to make any major additions to the base game. Maybe there will be a DLC, since the epilogues hint at it, but even then I just don't expect much anymore.
I have made my peace with the epilogues by now however. They're still miles better than what we had before patch 5. I take that over their original "plans" from the IGN interview.
The only benefit of a doubt I can give them here is the fact that she was a late addition, and the engine plotline was added very late in her development. So it might be more of a "well, we never did any content that was cut simply because we didn't have enough time to properly flesh out the alternatives". Although that just makes me think they should've pushed the game further back, instead of giving us an Act III that is very unpolished in a lot of aspects, and the weakest part of the game. It feels like Act I and II were done with a lot of care for major inconsistencies and plotholes, and III just was "lets wrap this up quickly".