They have said that in cutscenes they won't do that thing in halo where it only shows one player. This to me is confirmation of cinematic cutscenes

I'll reinforce what I said in the OP, Joseph Staten said in the GDC that they are cinematic focused story tellers. Staten's position at Bungie is the story lead. I'm not entirely sure what the official title is, but he has always been the one focusing on developing and unveiling the story for Bungie's games. During the GDC he heavily hinted at, if not confirmed, that they will be telling the story of Destiny through cut-scenes. I would expect cut-scenes, and most definitely expect story moments. Bungie has always made games which pride themselves in revealing to you their world, and the lore surrounding it. With something as big as Destiny, there is an endless possibility of stories to be had. Staten also said during the GDC that players will have questions, and it is their job to reveal to us those answers. I would honestly be surprised if there was one text quest like WoW. If you've played Marathon though you will know about the purely text-based, terminal-style, story progression and telling. It is in their history, but still, not at all the simple text quest that you would be familiar with in WoW.