The demo takes place in one of the early levels in the game known as the "TIE Fighter Construction Facility" -- it's a level you've probably seen many times before in trailers. The mission briefing goes: a Jedi General named Rahm Kota is attacking and it's your job to dispose of him, but to do so in secret (read: kill everyone, no witnesses). That sounds promisingly evil and very much Sith-like. Let the dark side coercion begin.
[Via press release]