If it picks up where Dark Souls left off, there's three options:
1. The "good" ending happened, and now the (previous) Chosen Undead has enlisted your help around Lordran. This is your duty. This might make sense for "Sacrifice Everything." 2. The "bad" ending happened, and now the (previous) Chosen Undead is a threat that must be destroyed. This is your quest. This might make sense for "Into The Beyond."
3. FROM will actually release two discs - one focuses on the DkS 1 "good" ending, the other on the "bad" ending. But what are the odds of that happening?
Yes, I know you're trying to do things the stealthy way, but sometimes the enemies get so plentiful you just want to blow 'em up.