The Swiss franc depreciated vis-à-vis the U.S. dollar today as the greenback tested offers around the CHF 1.0805 level and was supported around the CHF 1.0670 level.  Swiss National Bank and Swiss regulators announced new regulations today that mandate UBS and Credit Suisse to hold larger amounts of reserves to defend against crisis scenarios.  Data released in Switzerland today saw the March trade balance expand to CHF 2.01 billion from the prior reading of CHF 1.29 billion while the April ZEW expectations survey fell back to 53.4 from 53.8.  Dealers continue to cite talk that Swiss National Bank may be intervening by bidding the euro/ franc cross higher.  U.S. dollar offers are cited around the CHF 1.0920 level.  The euro moved lower vis-à-vis the Swiss franc as the single currency tested bids around the CHF 1.4320 level while the British pound moved higher vis-à-vis the Swiss franc and tested offers around the CHF 1.6580 level.