Switzerland’s Vontobel Holding AG and Falcon Private Bank, both says the cryptocurrency’s best days are ahead of it.The imminent launch of bitcoin futures will trigger a flurry of new product launches in the digital currency that are likely to push the price even higher, according to the private banks. Cboe Global Markets Inc. debuts the first bitcoin-futures product on Sunday, while CME Group Inc., the world’s largest exchange owner, will start offering a similar product by the end of the year