From what we've seen from the Taken King, Titans unlock Sunbreaker on Mercury. However, just because there is a background building at the lighthouse, doesn't mean we would ever go there. That has never happened in game before. There are plenty of background places that we will never go in this game. Anyways, I suspect that there will be a class specific story missions in the Taken King, and they most likely will be in places we have previously not had access to in story/patrol/strike/raid. We definately aren't done with Mercury just yet though, and that area with a boundary is going to be related to future content, no doubt about it.
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Good points but what about the bridge? Could be where the Titan receives new subclass as others in this thread have speculated.
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From what I could tell, it looked like the Titans visited the Burning Shrine in order to get the Sunbreaker (the Crucible map on Mercury). How they chain all this together is beyond me. It could be a story type mission with enemies you must kill, or it could be an exploration type space that you just go through to find the ability. Somehow they incorporate the Burning Shrine. I think the Lighthouse is going to be a staging area for this mission. Anyways, back to your question about the bridge. It could be a bridge, or it could be a light beam, like what you see in the Burning Shrine or other Vex locations (I'm on Xbox, so I haven't played all the Vex Crucible maps). I haven't ever seen a light bridge so far in this game (as far as I can remember anyways), that's more of a Halo thing. What I'm thinking you saw was generic Vex background structures. It's still pretty cool though. I have yet to go to the Lighthouse for myself, so I am reliant on others to see what is there.