so, i was thinking about this reef thing (
http://static01.bungie.net/pubassets/28630/events_09_19.jpg?cv=3983621406&av=3744551097) and the queens new missions, could it actually be substantial? bungie is known for keeping things back to surprise fans, and if this doesnt pan out, you could make a strong case that they showed virtually all of destiny before launch (aside from bosses/gear). and theres the whole "reviewers should wait to experience what destiny offers before reviewing" thing...
and there is this
]https://www.youtube.com/watch?v=gIp7vZuYzoA#t=687
from e3 2013 showing a cinematic not in the final game of the queens brother in old russia.
maybe not a new environment, but new story bits and cutscenes? or is this from the forthcoming expansion packs? i suppose it also could have been cut, but i see this as the least likely option.
EDIT: fixed links