Yeah, I think the agents notion is different from what people have been discussing with regard to advisors. Agents are a seemingly faceless resource you use to fix monuments, clean out noxious gas, etc etc, and you spend them like gold. I think the advisors notion, as someone mentioned earlier is from that leak about the golden keys, etc. About an individual who advises you. But advisors are all speculative.
edit: There is some cross over in the ideas, however, given shots like the following, which include golden keys. But again, that idea is only from that dubious leak.
*picture snip*
Can I just say: every time I see that slide with Dagna's name I get all happy

"awww!! My lil Dagna's all grown up and saving Thedas!" (Yes, I robbed a Disney quote, so sue me!)
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So, remember several pages back when people were wondering if Sam and Steve were confirmed as NPC LI's back when ME3 was about to come out? I was digging around in the old forums to see if I could jog my memory back to that time and definitely saw references to them as NPC romances back in at least January, months before ME3s release...
...but then I remembered that there was that huuuuge script leak for ME3, in - I
think - November 2011. Huge portions of dialogue and such were leaked, much of it ending up being in game. So I can't for the life of me remember if NPC Romances were officially announced well before game release or if it was all just in the leak and fans took off from there...
Which is basically just my rambling way of saying I can't find a BW "precedent" for announcing NPC romances before game release. Whether that translates to higher odds of Cullen being a companion or not? Hell if I know >.<