This mysterious black box has been popping up at select AT&T stores. Nobody knows what it contains, itâ€™s rumored to be housing the Dell Streak. Sunday is the day the Streak is rumored to launch. The box will be opened to reveal the gorgeous 5â€ Android slate. Itâ€™s rumored to cost $199 on contract, guess weâ€™ll just have to wait and see.