Two years ago it was only gold and silver that saw the CME's wrath on a daily, and sometimes hourly basis. Back then, however, it was due to soaring prices. Today, it is due to the bone-crushing price collapse in the Nikkei which has just seen the CME hike most Nikkei-related outright futures margins by 33%. So not only will those who resume trading Nikkei-related products in the futures market see a big loss in their P&Ls, they will also have to post some 33% more margin. We can only hope they still have some collateral and aren't margined up 100%. That would not be good for the Japanese pennystockmarket and "experiment" no matter how much good luck Jens Weidmann wishes them.
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Source: CME [5] [5]