By way of duckroll on neodgaf:
In the latest Dengeki Games podcast, there a mention of an unannounced sequel to a game which came out last year, slated to be released in Fall of 2010. The game is said to be challenging and extremely hard, with very "interesting" gameplay systems. Are there any real candidates from Japan from 2009 which would classify as such besides Demon's Souls?
Let it be, oh let it be.