If I remember correctly he said there's a very interesting quest line to get it, and I think he may be referring to the exotic that we have to collect 50 or so parts for across the destiny universe.
Just an idea though
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From my research and digging I thought that gun that you have to find all the pieces on the Dreadnought and go a quest to rebuild is the Sleeper Simulant, the heavy fusion rifle. But I guess nobody can be 100% sure about anything at this point. Either way I'm excited for all the new weapon chasing!
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I thought they had sleeper and than this other one where collected pieces from every location (earth, moon, Venus, Mars, dreadnought). But they very well could be the same gun with the one Luke recently referenced being entirely different