I seriously can't imagine that Original Sin will come out before late fall 2013. The reason I think that is because of all the requests for feedback they've put up in the past two months:

Does money have weight
Limited Inventory Space
Walking Tank vs Armoured Bikini
Auto-assigning stat points
Primary Stats
Weapon Types?
Open World or Linear?

These are not questions you ask when you have a nearly-finished game - ESPECIALLY the "open world" one. If the game were really coming out in May/June, all this would have to be set in stone by now. They wouldn't still be adding extra attributes, there's no time to change things.