It seems like this game has been leaked already, and it's still about 3 weeks away from release. It's pretty uncommon for a game to be leaked this early. Galaxy was leaked a couple weeks before release, Spore about a week-ish. Most games are usually out right around launch day.
Something I find interesting is that it's only 6.52GB meaning it's well below a full DVD9 disc, let alone a BR disc.
Anyways, if you're looking forward to this I'd look out for spoilers (i guess?).
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka