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!
The changes made to the PC version of the game are soon coming for the consoles. Changes are, weaker elemental weapons, weaker backstabs, nerfed ninja flip ring, nerfed hornet ring, weaker masks, etc.
Has anyone tested out the arena yet?