Re: 6 Years? WTH?
The cars drive themselves around the track, but the player controls the speed of the cars and where on the track they go (e.g take opponent on the inside, or just race down the middle) in addition to when to use weapons to slow rivals down. Do bear in mind that this is only one of many possible game-types, and that modes such as 'capture the flag' can be implemented in future via software updates, or possibly developed by the players themselves.
More details here: http://www.theverge.com/2013/10/16/4841798/are-anki-cars-the-start-of-a-robot-revolution
There are lots of software developers and hardware vendors who only target iOS devices, so Anki are hardly unusual in this respect. There is zero point generating more interest than you can currently supply, so you might as well develop for one platform first and then move on to a second or third. The choice of going with iOS might be influenced by the low latency of the platform, and Apple's inclusion of Bluetooth Low Energy - the latter of which only some newer Android devices support.