This could explain the price drop of Bitcoin yesterday.
Apple releasing an eCurrency does sound like a possible threat.
However; if it turns out to be just another digital 'gift-card', then it might even be good news for Bitcoin in the end, because of the expected increase in media attention for eCurrencies.
Of course it's just another 'gift card', or are you telling me that Apple will somehow allow you to get their coins, wait for the price to go up, then come back to buy their products at 1/3 the price?