It doesn't look particularly related to this news, to me. It's been bouncing around $1000 for days.
http://bitcoincharts.com/charts/mtgoxUSD#rg60ztgSzm1g10zm2g2...
Someone else posted a chart of the price in China, which does look like a "plunge" though the scale on the image is somewhat misleading (it also only "plunged" 17% or so).
I'm having a hard time viewing this level of volatility as surprising for Bitcoin. It's had a number of much larger drops, including recently (when it climbed to 700 and dropped back down to 500, for instance, on no news). I believe one has to view Bitcoin in the context of Bitcoin, and right now it is an extremely volatile creature.