These days, we're literally running the same software we run on everything else, but in a little box that has an audio/video output and a port for a controller. And then when I realized that, I immediately realized that the console is mostly dead. The only case where this isn't true is where performance metrics are consistent. This is why development on platforms like a PS3 or 360 result in shorter dev cycles and higher quality results: the hardware is all the same. But that matters when you're writing software that isn't shielded from the system, so with Java, that's a non factor, making Ouya nothing special.
I believe the next Playstation, Xbox, and Nintendo will all have their merits -- high-end hardware that is consistent for years, which will allow developers to rapidly build games without having to concern themselves with the lowest common denominator (it's ridiculous to see software designed to run on a 512MB 1 core machine performing horribly on a 24GB machine with 6 cores, 2 GPUs, and 3GB of GPU memory because it was decided by someone that progressive enhancement of features would be too expensive a development cost, or for those high-end features to be completely non-optimized).
For me, I am summarily unimpressed and not excited. For me, this is packaging Java in yet-another-box that I have to buy. Why can't I just download an app and play Ouya games on my PC? That's a -1 for Ouya and a +1 for what Valve is doing with Steam.