whos talking about regulating bitcoin.

Just the end points like exchanges, where it is necessary to entrust both fiat and BTC to a third party in order to be able to trade in real time.

Another interesting regulatory application would be tracing stolen coins to the point of exit: BTC to fiat or a product/service with the help of non Gov body such as Bitcoin Foundation+law enforcers in respective end points(where the BTC got changed to fiat/product/service). And ability to return stolen coins to the owner.