This project was actually started by someone else but :
Yes, it will be a storyline-based. Shame to waste resources on boring, repetitve RPGs. I mean, if you're going to do it, do it right.
(Storyline will be post-apocalypse, if you you were wondering)
It probably will be sort of an hybrid, main quest + commmunities. I was just mentioning the multiplayer opportunity because this will be mostly a server/client game.
Free world-ish, the game might provide tools for jobs and communities.
Yes, it will be graphical, as text-based RPGs would be better suited for AJAX
I would enjoy working with you, as this would be (definitely) bigger than for one person's scope :3