I was going to write that I don't think there would be much demand such a product, because if someone wants to invest in bitcoins, they can just buy them. However, I found to my surprise that there are funds that invest in specific national currencies, so I guess there might be some demand after all.
That's basically because most professional traders don't want to leave their Bloomberg terminals. If they can't buy BTC on it, they leave it to the specialized hedge funds and angel investors or invest in Bitcoin with their own money:
http://www.reuters.com/article/2012/04/01/traders-bitcoin-idUSL6E8ET5K620120401