The next-generation miniature set-top-box, which could be unveiled as early as this June, looks set to feature Siri-like voice commands and games console features and is set to become a serious Apple product in its own right. The hockey-puck-sized device that plugs into the back of a television set and connects to the internet, launches dedicated apps and enables the streaming of content from other Apple products, be they Macs, iPhones or iPads, has until now been described as just an interesting hobby by the company. In its latest earnings call on Wednesday, Apples CEO, Tim Cook, revealed that to date, 20 million Apple TVs have been sold and that it is becoming a key source of revenue, so much so that the company is no longer calling it a hobby. The reason that I stripped off the hobby label is that when you look at the sales of the Apple TV box itself and you look at content that was bought directly off the Apple TV, for 2013 that number was over a billion dollars, Cook said.