If you ask such a question you should state to what the Bitcoin value is doubling up to. I asume you want to know if the Bitcoin is doubling up against the US$.
If it is the US$ than it depends who is winning the The United States presidential election of 2012.
If the winners is Republican Mitt Romney the chances for Isreal attacking Iran is round about 90%.
If Israel attacks Iran there could be nuclear weapons involved.
So If there are nuclear weapons involved it could affect the peoples trust in specific currencies and it also could affect the international trades. If the people don't trust the governments of the world to regulate the money the would for example invest in Bitcoins.
So there is a possibility the BTC to US$ will *2 but there is also a possibility the BTC to US$ will /2.