The fact that the Gox gap is closing makes me suspect that a lot of this rise is coming from new money. I'm guessing few new Bitcoin purchasers are buying through Mt. Gox, which is driving the price up on other exchanges, and closing the gap due to Gox's illiquidity.
Speculation, but could some of the new money be coming from CryptoLocker[0]?
[0] http://www.bleepingcomputer.com/virus-removal/cryptolocker-r...