A rift may be forming between Piston Console maker Xi3 and Valve. A partially transparent veil of secrecy hangs over Xi3's pint-sized Piston Console. When first unveiled at the Consumer Electronics Show (CES) earlier this year, some surmised it was the official Steam Box, though Xi3 never came out and said it. And now that Xi3 is taking pre-orders, there's still no mention of it being a Steam Box, though it's clearly intended for living room gaming using Steam's Big Picture mode. Xi3 released a statement today that adds a little insight into its relationship with Valve, and also hints...