But a mainstream bureau de change? That's a serious thing, no matter where it's located. This isn't just mainstream, it's mainstream integration with the financial system. It's only a fews steps removed from HSBC or Bank of America doing a bitcoin account.
Yeah, out of most of the news I see about "new Bitcoin <whatever>", this really stands out. Makes me think that mainstream currency pair trading isn't that far off either by established forex trading desks. If that happens, forget the mickey-mouse exchanges we've been suffering with, its going to go mainstream with the trading crowd.
It's amusing to think where they might be sourcing their supply from. The only possible avenues are commercial mining companies (a few of those around now), and the traditional mickey-mouse exchanges, of course
Mining them in-house is only slightly more unlikely than using bitcoin-otc