I'm gonna remain civil, because I'm rather pissed at how the Beta's been handled (haven't even bothered trying to get in). Having said that, Agility is a new stat that is either confirmed or heavily speculated to affect roll speed and riposte (not parry) speed among other things. But I've heard (don't know specifics) that some stats weren't working properly, so those who didn't notice a difference may not have had anything to notice. Trolls aside, the Gamefaqs Dark Souls is a great place to talk tech and whatnot. Or even just following EpicNameBro\VaatiVija\AGermanSpy on youtube.
And if anyone wants to get some DS action, my current PSN is W-Lrd_GreyWolf. My Ciaran RP craves blood