I don't know what kind of capital controls they want to put through, but what they are doing seems totally unsustainable. From Zerohedge:
"The Swiss government has basically told the world that they will print as much money as it takes, and buy up as much crap sovereign debt as they can, to competitively devalue the currency.
"This essentially puts Switzerland in the same sinking boat as Italy, Greece, and Portugal… with one key difference: Switzerland has 0% interest rates.
In other words, you can now borrow in francs at 0% and buy government-backed euro garbage yielding 5%, 10%, 30%…. with absolutely no downside currency risk.
Here’s a practical example you can do– open a FOREX trading account and borrow Swiss francs at 0.5%. Buy the EURCHF cross and simply hold euro cash, paying 0.65%. At 100:1 leverage (quite common in FOREX trading), that translates into a 15% return simply for HOLDING CASH with no downside currency risk.
It’s free money, courtesy of the Swiss National Bank. I’m just waiting for the next wave of margin hikes. Needless to say, this is utter madness and will absolutely hasten the end game for Europe."
http://www.zerohedge.com/news/guest-post-immediate-effect