Well it looks like it will be a mix of both, but personally i hope it's more of a free roam game.

Hoping for sanbox esque, with a overall story who is volountary to follow and mission terminals to get missions to find gear and such. Dungeons yes, like in one of the interviews where the devs went to a underground facility on Mars occupied by Cabal and got some nifty weapons and gear at the end.

I'm hoping it's more free roam so you can travel around to different places and still encounter different enemies .... however it still needs to have quests ... bit like dc universe or Wow but this game can be much much better

Based on the interviews, GDC, and articles. It's safe to say that they're a lot of quests along with one main mission that is continuous. As it's going to be a 10 year long game. Expect expansions, DLCS, and more!

I think if each area is as big as skyrim, or at least near it then i can accept that or maybe two world type big. Theres no way they can give us a whole planet. I'm positive there will be alot of different areas on the different planets. But each place will most defenently be a large sanbox, with free roaming involved in some factor. The world has to be large if there talking about Sharing worlds with others. And then just randomly meeting people while your on a quest these places [b]can not[/b] be small.

I would say a more free roam based on the fact that this game is a "Shared-World-Shooter".