The PC version is now out. A simple mod will allow the game to run at higher resolution it seems. Some changes have been made to the game compared to console versions, for example the Dark Wood Grain Ring is now 25% of equip-load instead of 50%. Other similar changes are possible, but haven't been heard of yet.
Here's the resolution mod (?) http://blog.metaclassofnil.com/
http://www.forbes.com/sites/erikkain/2012/05/31/new-dark-souls-artorias-of-the-abyss-dlc-coming-to-consoles/
The dying will now continue in a scale never seen before, on all three platforms!
Has anyone tested out the arena yet? I believe the PC has this by default added to it?